Today I started to do what I assumed would be a rather easy job. I intended to make a polyboard panel to cover up the original green plastic wall paper on my shower wall. The shower wall is also the side of the rear closet.
I took some brown paper stock that comes on those large rolls, and held it up to the closet wall and pushed it into the edges to trace out a pattern.
Copied that pattern onto the polyboard an wal-la.... terrible fit.
Tried it again with a new sheet of paper, and made a worse one.
Now I eventually got it to fit, but its not great. One side is trimed out with oak molding and looks fine. The edge along the wall, is well, yucky

. I intend to caulk it, but it will then be yucky with caulk.
I'll attach a photo...
The real question is, how do you do this? How do you guys, and you know who you are, make those bulkhead walls that match the curve of the airstream perfectly?
I'll have to build a bulkhead wall for the fridge soon and my confidence is now shot

.
Need some pointers please.