If I did make one I'd make it as simple as possible; melamine wood for the sides, plexiglass for the front and a hinged wood and mesh lid
Plexiglass wouldn't work out cheap but would create an ideal hammy cage and a cheaper and larger alternative to something like a Marrakesh
If I did make one, the dimensions might be similar to the one in this video:
Misty's Spring / Easter Cage Tour - 2016 - YouTube