Agree with Green, there's so many variables you could analyze forever, you should continue with your plan to meet with some folks, learn as much as you can, and get more accurate estimates to see if this will fly.
Right now, you should build a financial model for the supply chain. Put in all the costs, direct and indirect, that are involved. Make sure you include margin for everybody in your supply chain. Right now, these are all guesses. The way we make models more accurate is to document our assumptions. Put those in the spreadsheet with the other stuff, and after you have a few meetings, revise it to incorporate your new understanding.
Worst case, you learn a few things for the cost of a tank of gas. That's a bargain. Let us know how it goes.