If my googling is correct the UHMWPE is a plastic slide that the drawers run on instead of metal rails?
That's definitely an option but if I do go the route of metal ball bearing rails, how do I attach them to 1/2" plywood?
I built my main box out of 5/8" plywood and countersunk 1/2 screws to hold the UHMWPE in place for the main slides. I also put a strip along the top edge of the drawer tacked in with a brad nail to help with friction as the drawers are pulled out.