As I suspected, it was a lot more work to get the hull interior smooth that it should have been. I started scraping & sanding away it it yesterday, and I ditched work, determined to finish. I resorted to putty fills in the dangerously-thin areas.
I decided to actually follow the instructions, and do the bow & stern areas first.
Its getting easier. Both ends took a little more than an hour, and it seemed less frustrating than the last time I glassed.
The glass in between the ends went down fairly well also. I gave it two fill coats, sanded & varnished. I decided to paint the areas that will be visible inside the hatches.
This shows how it will look when finished-a little more "stripey" than I expected.