Assuming this was in 'jest'.... If not, that would be a hard no.I am not spending $200-300 on a panel bond set up for a one time use. Nope. No way. I'll use PL Glue before I go that route.
Seam sealer is a definite possibility. Looks like 400 grit over primer and 80 grit for DTM.
Maybe I'll just fill the quarter panels with expanding foam?
Panel Bond/Epoxy if you have no intent of refinishing the exterior surface @ this time. Use it to anchor your filler piece @ select referenced locations (glue based spot welds for lack of a better descript). Seam seal as needed. This would allow the ability of an easier 'un-do' if you were to go into greater lengths in the future.