My partner wants such an item at the allotment. About 3m X 5m and high enough to walk in. I reckon a small commercial poly tunnel might be a better idea, but that would involve finding one second hand, transport etc as they're not cheap new (I know you can get bendy ones cheap, but they would not survive) Cage does not have to be substantial as only netted. Or just find a poly tunnel frame and net that maybe? Otherwise I'm thinking inch square tube?