Here are the sketchy plans I used to get the sheet cut
and plan all my lengths and such haha
Sloppy routing plans for tomorrow
4.5"x 1/4" channels for the heat tape to completely avoid rubbing wear, same 4.5"x1/4" channels down the legs to snake it through the shelves. and I'm thinking a 1/2"x1/4" channel for the probe on one of the shelves.
I think I decided on starting the tape channel about 3.5" away from the back of the 18" deep shelves that way the heat would stop about 1" from the middle of the shelf.