Had something similar with the Healey Club back in the late '80s with a series of races across US circuits, cars all shipped from one point in UK to one point in US and transported around the States by truck. Great fun, reasonably priced but took several years to organise.
Stab at minimum cost for 2 weeks $6k-$10k ?
Shipping, Packing (cars have to be secured with wooden frames within the containers)they also have to be fully drained of fuel and steam cleaned (US Dept of Agriculture requirement)customs clearance (will they want a bond in the US?), maritime and touring insurance can also be high cost, also what about overnight security wherever the tour stays?
However given the low cost of accomodation, food , gas (and repairs/spares)in the US if you can get the car shipping costs down you can count us in.[8D]