Zippy,
I did have to work ( cut and weld) the top outer corners on both sides of the quarters to conform to the extensions , and roll the lower part in as well. I also added some to the extensions to make it all match up. Not a lot though.
The back window trim areas were the worst of it really . I made the recesses for the lower corner trim a little deeper, as the cars I have seen the moldings don't seem to fit well there.
I agree you need that dutchman panel to get everything aligned.
It is a definite morale booster to have this much in primer. I blocked it out yesterday and re-primed it. I put it out in the sun for today .
I was really glad to see that the roof was in such nice shape. It will require a little work on the W/S posts where the roof panel joins them.
The doors will come back off soon after the blocking and priming of the quarters is done.
I want to see your build !

Thanks!

mark