That's precisely the point where it stops to work hehe! I can't build that hangar. It says to put it on top of the rocket silo but it don't want to get build there. It stays red.
You should be able to build it on the bottom left side of the silo check where the hangar is in this gif. There might be an issue with the spot not being highlighted
Nice it woked! I saw the reason why I didn't see where to put it. There was some pixel overlay. The hangar picture was partially hided behind that overlay until I clicked to place it. After that it was like your gif.
