Send me the ID you have and i'll be able to fill in some blanks. However I wouldn't spend any money on it as you'll never sell it unless it is a bargain as no-one will want to buy it as a Sandman. You will never find out what the paint and trim were, GMH never kept those records. Only way is by what is on the car now. In all honesty you are better off using the body to restore another very rusty Elizabeth assembled HZ Sandman.