Some things about #1 intrigue me. Now, I have absolutely no need for lighting sockets and whatnot. I don't like clutter in my cages. The reason I like boaphile over vision is that the cages are lightweight and have nothing unneccesary in them. If you were to use flexwatt for your heat, then I would be a happy camper. The problem is that in a reptile room you want to use the same type of heater for your stacking cages because the thermostat can't control both 3" and 11" flexwatt. I use 11" for all of my stacking cages.. if you have dividable cages, you're going to need the option of two pieces of flexwatt, one for each half (or alternately one in the middle that effectively heats both sides.

What I really like about your plan is the removable bottom for easy cleaning. It would have to be a perfect fit so that liquids could not leak through to the bottom and cause problems.

As I suggested in the first thread, the smooth plastic is a great thing for ease of cleaning.

It would be good to have the entire thing made of the plastic (plus bolts and whatnot) since it does not rot and is easy to clean.