Sam, The girl. How much? (asked in a Borat type accent)
On to the question!
I'm sorry to to tell you that I hang the quarters THEN try to match the outer wheel houses to them. Sometimes they require some slicing and welding to get them to match up.
I see that you already welded your outer wheel houses in. You need to stop welding and tack everything else on to see if you lost your reference points. Tack or cleco on your quarters and tailpanel. Then lay a decklid on and see if everything squares up. Taking off as much as you did without building a jig first could have everything off by just a little bit.
Rob