I'd be interested to see what you and your buddy come up with.
I can also tell you that 3D printing the plastic headlight rings has been discussed a few times on here. I don't know if anybody has tried yet or not. They are hard to come by and if you can find NOS, a pair will run you around $400, a good used pair, depends on seller and how bad buyer needs them.
A member on here is trying to find or see if someone can make or match the rocker panel retaining clips. Rocker panel molding came on Sport package for '69, not sure on 67/68 (but they also had rocker moldings). If you see a 69 Barracuda that has 9 holes (per side) in the rockers, it had the sport package. That's another example of unobtanium parts for both the aluminum moldings, but even more so for the retaining clips.
There's others too that 3D printing would be nice. Good luck with your project. I'll be following.
Thanks,
Dan
