Crosh, you should post ur Napkin Sketch on here...who knows, it may be useful with some input fron others.
Well, it goes something like this:
The entire system would be located in the Daggett/Barstow area of California. This site was chosen because it currently has a) easy access to a major highway and rail lines, b) central corridor to LA, Vegas, Phoenix, c) near to the town of Boron, d) near the Colorado river, e) close to Kramer Junction, f) experience in the solar power industry (re - Solar-1 Plant, and other large scale plants sited there).
Bring in water via pipeline from the Colorado - this is the "feedstock" for the hydrogen. Use high-temperature solar funaces to both supply power to run the plant, as well as perform solar thermal dissociation of the water to "crack" it into hydrogen and oxygen (note - this is something that can also be done by nuclear fission); byproducts of excess power and oxygen would likely result which can be sold on the market, of course. The resulting hydrogen would then be processed into sodium borohydride, using borax (sodium borate) from the nearby town of Boron (likely supplied by rail).
The result would be the product (fuel pellets) that was tested (and then "disappeared") by a company (no longer around?) called "PowerBall" (look up "powerball hydrogen" for more info). This "solid state" method of hydrogen storage was safer and easier to transport than liquid or gaseous hydrogen; the company was working with Ballard (IIRC) to develop a fuel cell that could run off the hydrogen produced. From what I understood, the pellets would be added to water, which would react with the borohydride (causing heat which could be used to make steam - or the water would steam - I forget - which could run an auxilary engine for extra power), releasing the hydrogen (which would of course power a fuel-cell or engine in the vehicle). The water and leftovers of the reaction (I am no good at chemistry - I forget what was leftover) - a solid leftover in the solution - could be extracted and reprocessed back into the borohydrides. This could be accomplished, likely, as part of the "refueling" process of the car (with the liquid/solid mix picked up later by trucks or such as part of the station refilling).
If made completely solar - including the pumping of the water and the rail transport of the borax - it would be a fairly energy neutral proposition, maybe...
That's the "napkin sketch" - big idea, and I am sure there are more than a few holes in it...