Looks like others have addressed coop issues. No one seems to have addressed the trampoline run...
How will you do the 15' diameter run? Also small for 8 full size chickens. How will you clean it? Get sick or injured birds out?
I have a trampoline that mat rotted off of & grandkids no longer use. Found some really neat pics/ideas on Google & Pinterest. BUT I had a series of 4 pens on our property that are slightly taller than trampoline. After just a few months of getting in/out while bent almost in half - my back & shoulders "said no", not to mention my head when i ducked wrong going through the gates a few times. Feeding & watering are very difficult - especially in winter (when it does freeze)or during/after hurricanes (Sandhills of NC). Getting eggs not in nest boxes almost impossible to reach - though better w/ long handled grabbers. Can't easily clean build up of manure or remove DLM - while "bent in half". These pens are approximately 8x8' or 64' square. Since these are open air coop/run - this allows for 6 chickens in a breeding group when mature. W/ free ranging time, I could possibly do up to 12, but honestly that's way to many...
So... are you putting a domed roof up w/ a walk through door?
When I do use the trampoline frame, will be cutting in half & using the two halves like hoops for a coop or run. Currently a project far down the list & hopeful to do before the frame completely rusts out. out... OR I'd consider w/ a domed roof with PVC, conduit or even cattle panels...
Those pens? They now have CP hooped roofs over them. Still a PITA to duck down through the gates. Currently no chickens in them & will do different feed/water situations when I do have them occupied again. New nest boxes will be on front of pens so won't have to enter to get eggs unless they are laid on ground.
You can see how I did our coops & those pens + some other uses for CP.
Coop, CP & Sheds
You can see how I do DLM & what some of the pens were like before they were hooped. Before you go through these pics - nothing fancy. Worked well for us, but we aren't in an HOA or a neighborhood. We sit .7 miles down a dirt road & even when in our driveway, most of these are not easily seen/noticed, LOL. I used materials on hand or could afford. Now, w/ more funds available & due to predators finding us, refurbishing/updating again...
DLM
Well, this is a bit all over, but for some reason, on this new phone or in the BYC app, can't copy & move things around unless I select all. Posting before I accidentally delete this detailed post while trying to change it around...