I agree very good job! I just acquired a trampoline frame and also intend to use it as a chicken tractor. I have 30 Cornish cross coming in 2 weeks and I plan to use this idea to house them. My current tractor is just so heavy I though this might work better.
I built one too, but getting birds out is difficult. Had a sick bird and crawling through poop and stuff to get to it....nasty. Moving them to a hoop house and using this as a puppy playpen instead.