Towel warmer or warming cabinet for an outdoor hot tub

Here is one place I found with free standing towel warmers, however they appear to be designed for indoor use. I would think that when it is really cold out only the part next to the rack would stay warm. I didn't see anything large enough for a full size bath robe.

My idea would be to get a large ice chest and build a wooden box around it to dress it up. Maybe have a little wooden rack in the bottom to put hot bricks on, throw the towels and robes in the dryer for 15 minutes and then put them in the ice chest to stay warm while you soak. You could heat the bricks in your oven or on an outdoor fire ring.
 
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