Glad that I have read all of this before trying it. I have six 2-month-old chicks that need their own space from the rest of the flock, at least for a few weeks (trip and neighbor dropping in to care for birds). I got a free barrel chicken nest box from CraigsList, and free trampolines are on CL all the time where I live. I plan to put the barrel nest box in the trampoline, on top of the stretchy part, which will be the flooring. Taking advice of putting stretchy part on ground. Will have to create top that keeps rain out, as well as put 1/2 " hardware cloth around it. Will also bolt frame together. Not planning on moving it --- just another space to separate poultry. Will post pics, feedback, and cost when I'm through. Main expense is the hardware cloth and a tarp since we have lumber laying around.
In the meantime, if anyone else has pictures, or feedback, I'd love to see/hear it!