3 x 2 would be ideal, the current trunk is a bit under that. It seems like all the foot locker type tubs have uneven bottoms for extra structural support.
I did a little more brainstorming and realized that I could use the bottom of a smaller tub, since I only need to have the heat mats on one side.
I'll use silicone to seal the floor, it's relatively quick drying and he's a real chill guy so he can hang out with me while it cures.
Nearly all plexiglass has too low a melting point to use with any che/heat lamp, they have a much much higher temperature than under tank matts since they use indirect heating.
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