good afternoon...here are two links to some premium quality punches...

http://steelstampsinc.com/osborne/leatherpunches_1.htm

take a look around...especially the #149 and #150 "belt end" punches...might work for door and window openings...

they also sell the "round hole" arch punches...in individual sizes and sets...

http://steelstampsinc.com/osborne/l-punches_1.htm

if anyone is interested...(in a few weeks after i get past some eye surgery)...i'll post detailed pix of the punches i use and a few related accessory items...

my very best regards...

howard...

The punches look very interesting, Howard. Thanks for your post. Good luck with the eye surgery--hope all goes well.