I replaced a door on an end cabinet that was damaged, I couldn't find a replacement cabinet or parts, at the time. The method I chose would be a good fit if you have limited sheet metal equipment, I made a frame out of tubing [I used 1/2" x 1/2"] and skinned it with flat sheet metal cut with, many, loud sighs here, a jig saw with a metal blade. Slow, Yes! pretty, well, no one has even noticed that it isn't sears original in the 25 years since and I am still using it daily. This could be easily adapted to your endeavour, I feel. Harry