Let me reinforce what Rob said:

Talk with PowerTrax first. Peroid.

You want to find out a) are they even remotely interested and b) what would be their requirements to move it forward.

For both the front ARB and the Tera 5.38's, the general deal was a certian amount of deposits before moving into R&D. The deposits were refundable only if R&D proved the part to be unfeasiable or if the required number of deposits were not recieved. After that, those who put down deposits would pay the balance upon delivery.

Again, talk with them first. And make sure you talk with someone who is interested in keeping you up to date on information and someone who is remotely close to the decision making process. Also, try and get them to commit to some sort of time line. Make it flexable, but don't get into a position where it drags on and on and on. As a warning, PowerTrax, in general, has been slighly less interested in the past when it has come to Isuzu interests.

Personally, I would approach them and tell them that you will push for at least 50 deposits in a certian amount of time. They handle the money, you just get people to contact them. I would suggest something on the lines of a $100 or $150 deposit to start, or something close to 50% of the final price.

Things to remember, this is hands down the worst time of year to start this. Second, this is a long road. People are going to have to be pushed and pushed. Money talks.

Good Luck,
Michael