Once turkeys gain some size a lot of people just give them a shelter to avoid rain and wind like a lean to. They need large nest boxes, we used medium dog boxes when I have my BB Bronzes. We used 4x6's as roosts but I think a 2x6 would be fine. 2x4s are a little thin in my opinion. I would wait...
I heard they can't be around chicks when they are young, due to Blackhead I think it's called. I haven't refreshed my memory lately though so don't take that quoted I would incubate just because I like watching them pip XD