The concept is great, I like were your going but I have a couple of suggestions. Angle the deck up and over were I assume the engine is in the cab so you can move the front car forward some, then only make it long enough that the rear car's tires are just on the bed. It looks like you may already be thinking the same thing based on the pencil marks on your template but if you could shorten the whole thing just a bit the proportions would be more pleasing. Just a thought, either way I am looking forward to seeing more.