Sorry no pics.
I have seen many freighters, that when hauling live, require a vet and handlers to ride in the cargo compartment. There is a pallet with 1 or 2 rows of seats, whatever is required, at the aft of the cargo area. There must be portable oxygen available and communications with the flight deck. The pallet (cookiesheet) has seat track bolted to it and even carpet. The seats are normal aircraft passenger seats.