Re:Concession Trailer help, any one from Northern California?
You do not need a cad drawing. A simple hand drawn layout of your project will suffice. It needs to show the scale, all appliances their amps, watts, btu's, etc, all plumbing, electrical with outlets, vents, hood, ansul, etc.
I spent north of 40k on a trailer by a CA builder and the detailed, hand written plans that they use were ok with every agency that touched it.