Personally, I love my PVC enclosure (Animal Plastic T12 to be exact) I like the fact that all the cutouts are already made for the heat tape and probes. I think it's would be about the same price (if not more) to build your own melamine enclosure and that would probably without the glass. Also, as many people pointed out, the PVC enclosures are A LOT lighter and in my opinion, easier to clean.

Good luck on the enclosure search!