Nice looking PO Box project.  Where do you get the doors? 

Dave. Actually, I find them where ever I can. I check junk and antique shops all the time. I find quite a few there. Also I found a full rack at an auction center and was able to buy it without bidding. I've used E bay some but you have to be careful there. With pictures you have to know what to look for and the price can go up quite a bit.