The roundhouse is as you notice a sixs tall affair with a several additions. Unless you want to scratchbuild you could of cause use available kits and repaint it white. The closest thing is Kibris #9452 and you can use the backextension kit #9454. For the boilerhouse you're on your own. The open pit turntable is pretty close for Pecos one but you can use almost any openpit turntable on the market, with a similar shed on its bridge. you are pretty close to the real thing.