My cages sit on stands made from two by fours (legs and frame for the top) and plywood (top). These stands are very sturdy, but not all that heavy or difficult to move.
My cage bottom is screen.
Its screen on top of an elephant rack and i have no problems and drainage is awesome. I have a shower curtain under the whole thing that catches everything and has a little collecting bucket under the center. it might not look as nice as some but who am i to mess with something that works well over something thats pretty.