Lots have been said about this before.
After receiving a very friendly quote for a batch of 6.9 baffle plates in glass fiber, the factory guy asked me if there would be other parts I would like to see reproduced.
First thing that came to mind were the firewall grommets. Easy job, once the 1200usd tooling costs has been paid for(!)
I also mentioned the hyper costly 6.9 suspension parts. We have a 6.9 standing here, and we'll be slowly looking into refurbishments and reproductions.
Still, I would like some input from those that know more about this then me.
For panels, as well as such grommets, the tooling cost seems to be the same for both.
In that light, what could be a good part-candidate for such a venture?