From theownerbuildernetwork.co This could be easily built using and old round trampoline frame repurposed.
Brilliant house ideas
They Bought An Old Trampoline, And Used It In Ways I’ve Never Considered. - http://www.lifebuzz.com/old-trampoline/
playground spider web with old trampoline
Recycle an old Trampoline frame -- Create this gorgeous garden arch from an old trampoline frame. Add some climbing flowers or vines and be the envy of the neighborhood!
"Old Trampoline upcycled into greenhouse. We wrapped this in plastic and it's been an awesome place to grow tomatoes and cucumbers!"
greenhouse idea using old trampoline frame
Old trampoline frame into greenhouse or chicken coop
homemade from reclaimed or recycled
Recycled Trampoline Hanging Bed! • Turn those old backyard trampolines into luxurious Hanging Garden Beds! AWESOME IDEA! I'D PROBABLY NEVER LEAVE OUTSIDE.
For the home 3
So smart! Your bunny get a big rabbit pen to play in, and you also recycle your old trampoline wich is great!
Kaninburar/ rabbit pens
What should I do with that old trampoline? - BackYard Chickens Community | I wonder if I could do this for a rabbit colony?