Nice "how to" mate, looks like a really neat job with the cutting there
.
I guess if you wanted a perfect roofline, the edges could be filled and rubbed down or even cut the donor section so that it follows the edges right to each door line, the front screen and rear hatch section (not forgetting a cut out for the aerial if it`s still needed).
Looking good though, you`ve done a lot of work on the old girl
.
Regards,
Ian.