I'm planning the same thing and asked around.
Usually the panels are form-fit, or snug-fit to each other. Not attached to anything.
I suppose if you take your tape measure and do some initial measuring around the trunk, you'll get an idea how much wood you'll need. I'm going to use 1/4" Luan. It seems to be stronger at thinner dimensions than regular plywood, and it takes glue nicely. It also keeps the panels lighter.
I was just going to upholstery glue foam to the panels and then figure out what I want to cover them with.... probably vinyl.
It'll take some trial & error on the fitment part..... buy extra wood!
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