I am heating it with exo terra heat wave, attached to a thermostat with tile over it. works perfect, and the heating pads all have air flow.

its was not a book shelf. i could not find a book shelf that was 4ft high 3ft long and 2ft deep. most book shelves are not that deep XD so i had to build it from scratch

but it was pretty easy! the Plexiglas was the only tricky part for me.