Kerbal creator figured out an ingenious way to redesign his new flight sim's map: import it from Cities: Skylines

Cities: Skylines
(Image credit: Paradox)

Tell me an RPG developer used a tabletop roleplaying system to sketch out the design for their new videogame? I sleep. Tell me the creator of Kerbal Space Program used another sim—the most popular city builder of the past decade—to create the map for his model plane flight simulation? Real shit. I can't think of a more PC gaming solution to indie game development.

I recently chatted with Felipe "HarvesteR" Falanghe about Kitbash Model Club, a relaunched version of a game he first released in early access in 2021. At the time it was called Balsa Model Flight Simulator, but Falanghe explained the new name, new publisher, and new scope (read about all that here). 

Then we started talking about the map. Kitbash Model Club is set in a bay with a pair of islands at the center. It was originally sparsely detailed, because Balsa started as a VR dogfighting game. Now that space needed to be explorable on foot and from the perspective of small model vehicles, it needed to be much more intricate. It's also nine times bigger than before. How'd they pull that off despite being a tiny three-person indie team?

"We really had to rethink our whole approach to the map design and how we were putting it together," Falanghe said. "We actually ended up redoing all of our tools to generate the world, to a point where we could import vector data from OpenStreetMap. We really wanted our map to be the same fictional bay location, so we used a city builder game with a mod that could export OpenStreetMap data. It exported the layout, no assets or anything, just the layout as vectors. So we got to build out a model of our world and plan out where things go, then we had vector data to generate the world in a semi-procedural way."

When I asked, Falanghe confirmed that the game was Cities: Skylines. Turns out we even wrote about just such a Skylines map way back in 2015.

"We used it, essentially, as a very user-friendly level editor. If you think about how SimCity came to be, it was originally a level editing tool that Will Wright came up with to create the world for a helicopter game. So there is a lot of overlap, historically, between city building games and level editors. They kind of share a common ancestor." 

That game, by the way, was not SimCopter, but Raid on Bungeling Bay

Wes Fenlon
Senior Editor

Wes has been covering games and hardware for more than 10 years, first at tech sites like The Wirecutter and Tested before joining the PC Gamer team in 2014. Wes plays a little bit of everything, but he'll always jump at the chance to cover emulation and Japanese games.

When he's not obsessively optimizing and re-optimizing a tangle of conveyor belts in Satisfactory (it's really becoming a problem), he's probably playing a 20-year-old Final Fantasy or some opaque ASCII roguelike. With a focus on writing and editing features, he seeks out personal stories and in-depth histories from the corners of PC gaming and its niche communities. 50% pizza by volume (deep dish, to be specific).

Read more
Dean Hall at GDC 2025.
Outer space inspired DayZ's Dean Hall to become a modder and game developer, and now he's making a Kerbal successor called Kitten Space Agency
The player stands in front of a gaping hole in their neatly trimmed garden lawn, with the rear of a house and decking in the background.
Designed in just a few weeks, this $5 indie game about digging a hole has journeyed to the centre of Steam's top sellers chart
Factorio base screenshot with photo of Oppenheimer actor Cillian Murphy in front
The Factorio 'God Factory' was one of this year's greatest gaming feats: 'Most players will never find themselves hitting the limits of the game. We are.'
The Talos Principle 2 screenshot
Croteam 'never planned to make' its philosophical puzzler The Talos Principle, but it emerged as a 'happy accident' while working on Serious Sam
A cloaked man ponders an offering of gold in a large chest in Streets of Fortuna.
This ancient city sim constantly simulates 1000 NPCs in a clockwork murder sandbox where you can poison someone's drink and leave 'confident that you've pulled off the perfect crime'
Cards swirl in an interdimensional vortex in Balatro's trippy intro sequence.
LocalThunk gave up making Balatro for 3 months but resumed because 'I was bored but the internet was out so I couldn't play Rocket League'
Latest in Sim
An ancient, angry stone mech from No Man's Sky's new Relics update
No Man’s Sky lets you unearth ancient, angry mechs in the astro-archaeology filled Relics update
Dwarf Fortress adventure mode art
After 23 years of making Dwarf Fortress, even its creator is still 'terrified' of drowning all his dwarves with aquifers: 'Part of the problem is we are just not good at videogames'
Tarn Adams, who cofounded Bay 12 Games with his brother Zach, talks about their single-player simulation game "Dwarf Fortress" during an interview at their home office in Poulsbo, Washington, west of Seattle, on December 9, 2022. - A cult favorite among indie game fans, "Dwarf Fortress" has been available for purchase on the Steam online store since December 6, a first for this title that has been distributed for free since its debut in 2006. The real-time management game, set in a medieval-fantasy world and involving overseeing a group of dwarves seeking to build a mighty fortress, has climbed to the fourth best-selling weekly title on Steam. (Photo by Jason Redmond / AFP) (Photo by JASON REDMOND/AFP via Getty Images)
Dwarf Fortress' creator is so tired of hearing about AI: 'Press a button and it writes a really sh*tty, wrong essay about something—and they still take your job'
Decorations in TCG Card Shop Simulator
TCG Card Shop Simulator finally adds the ability to decorate our stores, and suddenly all my profits are being spent on adorable Pigni posters
A person on a snowmobile riding a track in the forest in game Sledders.
Powder enthusiasts seem pretty pleased with new physics-based realistic snowmobile sim Sledders
Dean Hall at GDC 2025.
Outer space inspired DayZ's Dean Hall to become a modder and game developer, and now he's making a Kerbal successor called Kitten Space Agency
Latest in News
A female Zoi making two hearts with her fingers.
Following 24 hours of Denuvo-based backlash, Inzoi is taking a surprising step and removing it entirely: 'We want to sincerely apologise for not aligning more closely with player expectations'
An image of a Helldiver from Helldivers 2 shooting at a red dragon from Dungeons & Dragons.
'Ok, so dragon builds are a thing now': galaxy-brained Helldivers 2 player incinerates a bile titan with a hover pack and a flamethrower
An ancient, angry stone mech from No Man's Sky's new Relics update
No Man’s Sky lets you unearth ancient, angry mechs in the astro-archaeology filled Relics update
Assassin's Creed Shadows promo image
Ubisoft scores a legendary ratio against Elon Musk on his own platform—which hopefully marks a final end to all the Assassin's Creed Shadows' culture war nonsense
Tzarina Katarin Bokha, the Ice Queen of Kislev
Total War: Warhammer 3 rolls out a cool Kislev overhaul, changes befitting Tzeench’s magic, new projectile units and creakier skeletal horses
An image of a golden first place award from Geoguessr
'We're actually getting GeoGuessr on Steam before GTA 6': the Google Street View puzzler arrives on Valve's platform this April