I'm going to start building my viv in about a month or two, and I was wondering, do I need to frame it? It sounds to me, from what everyone else has posted about their enclosures, that framing isn't really needed... you can just use plywood to build a box and you will be set. Is this true, or is there a size limit beyond which a 2x4 frame is absolutely needed? I thought maybe that it would helpful for securing branches and other things, and that I could put insulation between the studs to save on heating a little bit. It also might be nice to route the wires through the walls... any suggestions?