little bit of progress here to report...

Heres how I machined the center
http://i385.photobucket.com/albums/oo291/mack1416/13d6f39c.jpg
http://i385.photobucket.com/albums/oo291/mack1416/700a0a02.jpg

heres the fit.. fits pretty darn good if I say so myself.. i am not a machinist.. but ill pretend..

http://i385.photobucket.com/albums/oo291/mack1416/2394257e.jpg
Next step is to figure out a good clamping method to keep it from shifting around and weld it in