Just finished waterproofing my new plywood enclosure, using Thomsons water sealant (hope this stuff works). I am thinking about installing some plastic or some kind of extra coating on the bottom few inches where the substrate will sit. It is 48 x 24 x 24. I will be installing the plexiglass doors as soon as the track comes in the mail (I found it online for 8 bucks). I do however need ideas for ventilation and heating/lighting. Advice would be much appreciated. Thanks guys.