Wow! Amazing, just amazing. I was expecting something like "Hardware Wars." I particularily like the visuals and the pacing was excellent.
I do have some suggestions, though.
First of all, I didn't quite understand the story. Was it a conicidence that the medallion that they're looking for just happened to be near Ben Ravenwood's homestead? It appeared that way to me.
Secondly, the train had weeds growing underneath it. Removing them would have helped create the illusion that this was a working locomotive, rather than a park engine. And having the engineer inspect the train wasn't too plausible since it was obvious that the locomotive hadn't been run recently. Those engines make noise and emit steam for a long time after they've stopped moving.
And thirdly, the closing credits had significant typos. Cannibals was mispelled repeatedly.
And when you wrote that the project had "on ties" with Lucas Films. I'm pretty sure you meant "no ties."
I know that these are small details-- but it's just those small details that create believability.
I hope that helps.
I'm very impressed with the cinematography, though. Very professional-looking.