PM me the VIN off the skinny plate, and off the ADR plate the chassis number, seating capacity and GVW.

Without the BODY plate you are pretty much screwed though as it'll never be worth more than a replica Sandman ie no-one will pay Sandman price for it with missing tags. If you are keen on restoring it my advice would be to sell it and buy a complete Sandman to restore. Unless you can find original paint on it there is no way (currently) to know what the TRIM line is on the BODY plate either. Working out the driveline is relatively easy but the diff ratio would be an educated guess.