Thanks everyone!

Strick the reason I don't want to do a continuous piece of flex watt is that there would be about 6" between tubs that just wouldn't be heating anything but the air.

I did find some flex watt soldering videos on YouTube this morn so I think I've got that part covered. We have some old stuff here that I'm going to practice on.

And I did realize I can only fit 9 bins this way but I'm just going to set a bin w/ lid on the top shelf. That way I can even keep a few (corn snake) hatchling bins up top if I need to.

Was hoping to get this done soon but now my boyfriend dislocated his shoulder so I don't know who will help me. I'll still post pics when it's done, just might take awhile