I posted here a few months ago about buying a huge plexiglass pillow bin from a local linen & things store (their chain went out of business). I and my son finally got around to rebuilding it last night for his Ball Python. It came out better than I expected. There are 2 groups of small vent holes in the lower rear right side and lower front left side and a small water fountain rear left in the 'final' pics.

The UTH will be under the right side, all the plexiglass is 5/16" thick except the sliding door panel which was originally a center divider - you can see the guide runners for the center piece where it slid into along the front & back (which now runs horizontal along the front/back panels) as we turned the 'original' storage bin on it's end to make the 'tank' taller.

-Jim
home-made snake tank