I to am going down this route . How did yours pan out. looking at a support/living van to give the driver/fireman some were to live on a loriot .Tar wagon and stone. to complete. Scorpio shows rectangle water cart .loaded on the F2 . Ted Kansas in GWR models is using a round tank ? Wondered if to apply tar. And possibly a horse box to move living van and water/ tar sprays ? Cart for moving stone. Bob savage