I built a custom wooden enclosure. I used plexiglass for the front door, and I also used plexiglass for the floor. The floor is actually raised 1" higher than the bottom of the cage. I built a small ledge along the inside bottom, placed the plexiglass on top, and then sealed the plexiglass/wood joint with silicone sealant. I slapped the flexwatt on the bottom of the plexiglass -- works great!
Good luck!
** In case I wasn't clear -- plexiglass IS the floor -- no wood on the floor... make sense?
George 
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