Shine - no stringers on the HMD! It's like building a big D4, just frames. Mine has "stringers" of 3/8" ply taped between all the frames to seperate compartments for storage and foam, and to provide (in my mind at least) extra rigidity of hull and sole, but all were fitted in place and cut by Mk. 1 eyeball, not plans. The trailer bunks are sitting under my "stringers", which run from the motorwell side walls forward to the berth uprights, in the space where no longitudinal components were required.
The bending experiment seems to have worked well after a few days of drying out - I removed all the straps and the bunks have held their curve. Probably because living in Guam is about the same as living in a steambath, just with more UV exposure...
As always, thanks to all for the kind words and suggestions. I thought my progress was pretty good up to the painting point, then everything slowed to a crawl and time became a rare commodity in my life. Watching Cedarock launch while I still wasn't even on a trailer was hard...
Final adjustments today and then a little more electrical and then off to hang the motor!