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Sounds ok to me, but with the hides, its probly better to have two than have one small hide half on half off the heatmat. might be worth a couple of dollars to find a bit bigger box the same kind, from cheap shop or go-lo etc etc. that way your heat man can still be under it at one end but you can add extra places to hide, and a small branch etc, just dont forget to drill vent holes. Im only assuming the container your using is maybe, the size of a lunchbox? if so you could go a little bigger since your only heating the floor anyway. hope that makes sense. cheers.