Grigg,

Yes I drilled the rivets from the inside out, because I could not see them from the outside of the rim, then cut the rim and the center dropped out

heres a shot, im committed now... next up is clean the outside edge of the center and make my measurements for machining
http://i385.photobucket.com/albums/oo291/mack1416/1a137bf1.jpg

Crenwelge... the rims are NEW drop center blanks from coker.. although I wont be using the drop center to maintain the offset to the mounting flange it will fit on the outside edge... at least thats the plan anyway... we will see how it goes...