Rich at reptilebasics.com can hook you up with some flex and a t-stat.

that UTH on the tank is going to be a Pain in and behind to get off. you can give it a try but if it bends to much you can break the heating elements then it's garbage. flexwatt is cheaper and in my opinion way better then those zoo med ones.

and for holes in the tub... most people use a soldering iron which can be found at walmart or home depot. you have to work it out yourself how many holes. just melt some and let the humidity settle, then if more is needed keep at it untill you get the right humidity. remember you can always add more holes and if there are too many you can just cover them with some electrical tape.

if your tubs will fit tightly on a book shelf go for it. but if not you'll have to use the lids.

hope this helps