Caldy - I applaud your efforts in trying to get this made but I think you're going to end up getting a bit frustrated. This looks a bit like "design by committee" and, therefore, is going to drive you up the wall
IME it really just needs one person to drive it forward and foot the initial bill and then let other people buy them if they like it enough. That doesn't mean, of course, that you don't take the ideas and suggestions of others into account - but that you basically aim to make something that *you* want (and, in all likelihood others will too).
One way of doing this would be to say to Argon that you would effectively act as guarantor for any upfront design/tooling costs but that you want a royalty on any that they sell to other people - after all, you took the risk in funding the tooling costs so you should have some reward if they sell loads of them. Alternatively, if *they* take a risk by funding the tooling, they should get the reward.
Just my 2p, take it or leave it

06 Phantom Black Saloon:
DONE: Water Meth Injection, Carbon clean at 64k, CAI, Gutted Precats, Non-res x-pipe, H&R 8mm spacers, H&R springs
^ GONE
