That's one of my intentions. Back when I worked with the engineers from A/D/S on a side project we had a OEM design that worked incredibly well but was impossible to vacuum form or injection mold because of the complex shape. But it can be 3D printed. The patents are expired and I'm the only one...
Speaking of Stout, there is an instagram page when a woman is building a 1964 Stout. Rolling and forming all the body panels and even scratch built A-arms.
Worth a follow if you're into that.
https://www.instagram.com/six_four_stout/
I can't speak for filament as I only print with resin and powder but I've come across some resins that can handle load and temperature. But it's not $20 model resin. They cost $80 to $500 per kilo.
Just about any of the nylon powders are up to the task.