cut some patch plates
burn em in
grind and turn them down ( have fun facing threw the weld)
Ready for some new holes.
Removing rear hubs alone is a pita. After you have done some I think youll find your undercutting yourself. All this and you can get TRUE pre round already 5lug ones from a ms123 crown for about 250 shipped from aus if you look in the right places. Or you can purchase from s9 in the same built manner.
Machining new hubs would be stupid and pointless as you have to waste a ton of material its gunna cost a shitload, their splined, take forever and the market is very limited for them.
Gl with it man.