I don't have photos to share, but let me describe what I did. I had a trampoline whose frame & floor were fine, but the elastic bands that secured the floor to the frame were fraying so that it couldn't be used for jumping. I stretched 2"X 2" wire all around the outside of the frame, securing it with good ol' plastic zip-ties. I could have used bits of wire to make it more permanent, maybe I'll do that a little at a time as the zip-ties break & need replacing. I also zip-tied some plastic landscape edging all around the bottom edge around the frame.
For the door I made a frame of 1" X 3" wood, about 20" square I think, set with hinges & a latch in a frame that is just large enough to fit around it. I secured the outer frame to the wire around the trampoline frame with mending plates screwed over a few of the wires & into the wood, and cut a hole in the wire mesh to accomodate the door.
I have woven strips of plastic mesh through the spaces between the elastic straps that hold the floor of the trampoline to the frame around the top. And secured a long section of wide PVC across the top from which to hang a feeder. There are also long pieces of pipe stuck through the wire mesh and going across part of the middle for roosts. And a sheet of corregated plastic secured over it to keep the birds dry when it rains.
If the elastic straps on this trampoline were still in good shape & we wanted to keep using it for recreation, we would have to constantly add & remove the plastic mesh around the top, the pipe that holds the feeder, and the plastic sheet that protects the birds from the rain.
A determined predator could possibly dig underneath the edge of this, or claw through the plastic mesh woven through the spaces between the elastic springs. I have lost a few birds to predators who reached through the side & grabbed someone who was perched too close to the wire. I have tried to remedy that by placing denser mesh around the sides near the roost.