Nonsense- Buy yourself a book about basic carpentry. It's just a matter of measuring cutting and screwing together. Basic power tools are incredibly cheap these days. You only really need a tape measure, a power drill/screwdriver and a circular saw.An adapted garden shed would probably be great actually. The problem again is the 'adapt' part. I cannot build, modify or adapt things. When I move to my acreage I'm running on the assumption that every little thing will have to be 100% purchased, expensive as it may end up being. I get the feeling I'm alone in that sense, because of the non-availability of big roomy coops and the fact that, when I browse around online, it seems like eeeeeveryone's building or adapting their own. I suppose I could download some instructions and try, but it would probably be a total unmitigated disaster. Would probably hit myself in the head with some tool and end up in hospital.Also I would not trust my own (inevitably) shoddy work to keep the chickens safe - which is the main thing in the end.
I had a look at Bunnings' metal aviaries the other day. They do class them as chicken coops too, but I get the feeling they wouldn't make that great of a coop. Most of the space is vertical space, as that's what works for an aviary. Vertical space would be nice for having a lot of perches, but the ground space in them is quite small. That's a concern not just for chickens in general, but it also would be a concern if I wanted to have ducks, geese or any other birds that sleep on the ground.
I'll see if I can look up the sheds you mentioned, thanks.