Feeding issues

Personally I'd check Home Depot or Lowe's first. Even if the pet stores sells something to split that 60 with (which I doubt they do), they'll charge you an arm and a leg for it. If you do the measurements, decide what medium you want to use to split the tub then hit one of those hardware type stores they usually will do your cuts for you to spec since a lot of things require a specialized cutting tool so they don't chip or split. They only thing you might need from a pet store that specializes in fish is the aquarium sealant. Also make sure your measurements are perfect as any space at the top will allow one snake to squeeze over into the other side. Also you'll probably need something to safely house them in while you rehab the 60 gallon as I'm not sure what the set time is for that sealant.

Split tanks are very hard to provide a proper temp gradient in ... and if it is worked out, it's terribly inefficient and a waste of energy/money in my humble opinion ... If you're set on a display tank, something purchased or custom made with a solid top and vented sides is much better and of course when it comes to maximum security/ease of use for your snakes, sweater boxes are where it's at.

-adam