I think Oldsub answered most of your questions.
Sometimes I may be guilty of talking too much...
Robert how did you locate the IFS centerline when you did yours? Mike's question is a fair one, and one I didn't really remember anyone else clearing answering.
Also Robert, did you find the area of the frame that meets the top of the crossmember matched up flat in that area? On my 1-ton it did not, but I don't know if it does on a 1/2-ton.
