Paul,drawings for roundhouse are from the USA
http://www.gardentexture.com < Link To www.gardentexture.com, had to modify somewhat, the drawings were done probably 15 years ago when the 2-6 -0 s were the longest LGB American outline locos, and I wanted to store my biggest, Mikado, plus any visitors. So I lenthened some of the stalls to 42 and 48". Bob, owner of GTexture said he is working on a new, longer, designs, but he told me this 2 years ago ...
The turntable drawings are from Canada, not sure about his website, Brewer Rail Road Plans,1923 Evergreen Drive,Agassia, BC VOM 1A3. Again these were on the short side so I made sure I could take a 48" loco. Good tips on mechanism.
If you want any more details let me know, but be warned I could bore you to death several times over.
Sandy