I have some models of C & Z cold rolled members based on the dimensions from Garco Metal Buildings if you'd like them. Mostly made up of C8's 10's & 12's by varying thicknesses. Drop a direct mail if you'd like them sent.
deckert*owt.com
It's a great website. Once I found it, I never had to go hunting again! A lot of excellent high-res textures license free for commercial use.
(didn't realize how much I sound like an infomercial. lol)
I've seen some pre-built components like these in your photo (nice porch!), but you'll have to search each keyword here, and over in the old forum's archives. Best, Tom.