Hi Beano, no problem, I know how it is ......
Hope this will give you some ideas:
Started out digging small holes for the uprights (12 inches deep)
Cut 1 1/4 inch tube to length, then painted with antirust except ends to be welded.
Set it all up, then welded corners (you only need a small machine, 'cos its tube)
Put concrete in holes round uprights, and painted welds.
Made a little footing in concrete to keep out rats and foxes (hooks set in concrete before dry to attach netting).
Chicken netting round sides, and nylon netting on top ("stiched" on with black nylon string).
Dims: 6 m x 13 m x 3.00 m high.
I left stubs so I could enlarge later, but never have.
I made two netting doors using ¾ inch tube (2nd pic):
1 for everyday use: 1.05 m x 2.00 m
1 for cleaning out and transporting earth, sand etc: 1.80 m x 2.00 m. Usually locked.
The site was on a slope, so made the footing stepped. Its handy to have a slope, as the water drains out faster when it rains.
Have never covered it, cos they've got quite big sleeping quarters (about 3 m x 3 m: you can see it on the left.). If you want to cover, take the slope into account with height of posts.
The welding isn't that difficult, but if you don't know how then a mechanic can do it in a couple of hours.
The whole thing took about 4 days for the two of us (with coffee breaks).
Planted elderberry, rhodos and holly which all resist their pecking. Holly wasn't a good idea as the old leaves that fall are very prickly. Going to replace with something else, but don't know what. Got any ideas
Good luck with project.