If you need any help with the config feel free drop me a message, I've built two and am (slowly!) gathering bits for a 3rd.
As said a 39" or decased 40" and some 42" will fit in a standard body, and in my opinion look nicer, make sure you get a 1080p panel in there though (or 4K, but who has one of those just knocking about!)
I've built my own cabs so far and its not that much of a task (but I wouldn't inflict my carpentry efforts on anyone else!)
There are a couple of other Vpin heathens on here too who I'm sure will chime in if you need help