Nice catch on the 1/2", yes it was a mistake. The rails and stiles are all birds-eye maple 3/4", backed by maple plywood. The front is the same. I am using biscuits to join the two stiles to the legs, and pocket joinery for the rails. But I may back the rails up with 3/4" ply and then join that to the legs with pocket joinery just for strength and to pull it all together.

So you think under mount would be better then side mount? What does one usually attach the back of the slides to?

Jim