I would just model it in Blender or whatever 3d suite you prefer and import it in. Here's a blender tutorial for unity but the process should be the same.
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I know this is old, but I'll answer it just in case for the future
Just looking at the code it seems just to be typescript and electron. So technically speaking all you have to do is find the three.js camera object it's using. Maybe they're just wrapping it with their own abstraction or something. They could be contaminating the source of three.js and modifying the behavior for their own uses like prototype, but that's really looked down upon.
Just looked at the code here. And just as I suspected, they're wrapping the three.js class with one of their own. You should be able to access it with the property "threeCamera" or "unifiedThreeCamera" on the Superpowers camera class.
Has it really died off? That'd be a real shame. I'm thinking about using it for a serious project soon and all I really is desktop support. From what I'm gathering this tool is super extendable so no need to be worried since you can always just update it yourself.