Quote Originally Posted by M.B.A.
lol, the hut is only 5ft tall x2ft deep x 4ft wide, how deep should my lower portion be?12-16" tall and longer? I would like to utilize most of the inside floor area as much as possible
IMO the 2'x4' tray should be your res., something smaller for the tray. You won't use the full 2'X4' at the base of the plants anyway, and you need an easy access to the res.

You won't get much of a lower profile than that.