Sturid necwbie question (and I have searched before posting), but what exactly makes this construction method:
So vastly (and obviously) superior to this one:
What I'm talking about is how the headliner is installed. Seems to me, there is more support for the headliner in the second photo, which would follow the contours of the sidewall
exactly, and if building from the inside out, use of a router & flush trimming bit would ensure super-exact fit of all panels. I have a construction plan in mind, which is easier to imagine that to describe, but my headliner goes in exactly the same way as the second photo, then wiring installation, insulation, and finally exterior skin.
What I imagine for my own build, is to cut an interior skin & frame it with 3/4 dimensional lumber, install a headliner (exactly as shown in photo 2), wiring as needed, add spars, install outer skin on sides (flush trim w/router), then install roof material (once again, flush trim w/router).
It seems simpler to me, coming from a more conventional residential construction background, to install the headliner, screwing nailing or stapling it to sidewall assembly, before insulating & installing the outer skins.