I must be missing something. First though I had was a wooden spring of some kind to give you the push release action. Understand not wanting to do some kind of plastic mass produced stuff, but and 1/8 inch splint mounted at an angle to push the drawer forward should be long lasting. You may have to put a dado into the back of the drawer to help with alinement. I don't think you need metal tracks to get a smooth enough operation. Just need a strong enough spring.