I decided to go with Joe Lewis' idea. it has a pan in the bottom that is 30" x 30" and 9 inches deep. i will fill that up with a laying substrate. the rest will have 2 inches of sand and lots of furniture (hides, climbing, etc). it has a bank of bulbs wired into the left hand side. the hole going into the pan which is removable from front and back is 2" x 2". it is air tight from the front and back and sides, so the pils can't get out from the pan. I like the way this cage looks and i think they will use it well, time will tell.
i will post pics again when it is setup. who knows when i will actually get around to posting more pics though, lol.
(ps: the builder took these pics at his place, this is the first time he has built this cage)
andrew




