How much would this total?

So I'm wanting to make a movie that takes places during the 1920's-30's period. I want to keep the movie as authentic as possible. It's about prohibition and the influence it had on American organized crime. So I'm gonna need guns from that period such as: the Thompson, Colt .32, M1918 Browning Automatic Rifle, whippits, cars from that time such as the Ford model A, Rolls-Royce (Phantom), 1920's hearse, ect.. How much do you think production cost would be? Do you think I would have a hard time finding someone to produce the movie?