So today was sort of a wash at working on the teardrop (dog training, laundry, a nap and a date but no trailer). But.. I did get a few minutes in just now. Right before I threw the last load in the washer.. what better time to attack foam with a surform plane!

I stood both sides up on the trailer floor, and clamped them together at the perfectly straight spots in the trailer profile. in my case, the center of the top, the center of the front wall and the bottom four inches of the back. Those all lined up fine. I then set about planing down the difference in the curves I had cut with the jig saw. At the worst points I was 1/4 inch out. So not too bad. And everywhere I wobbled I wobbled OUTSIDE the intended curve (which is what I was trying to do)
I had a small metal square along. I'd just shave down the high spots until they matched the spot on the other side. Then check to make sure the whole edge of the 2 in foam was level across all 4 inches of combined width.

I did move the clamps around a bit to make sure the area I was working in was well stabilized on a few occasions. All in all it didn't take long.
Tomorrow I'm going to go out with some tape and lay out my windows and shelves and dividers and things. If that goes well I'll probably glue the sides to the floor. I will have to think on how to clamp that down, since gorilla glue likes to move.