Thanks fellas. I hit the snag that I've been deathly afraid of all along with this kit and that was a
really bad lip / overbite at the very top of the fit between the two.

It was enough to make me consider ditching the whole thing but I'm using filler and trying to make my way through it. After recovering from my "aw sh#%" moment and thinking about it, it should be nothing that a little sanding and repainting can't fix.
The way I look at it, if I can take this:
and graph in another section of wheel opening from a '54 Chevy Panel Wagon:
and smooth it out like so:
Then I can most likely handle this.
