Strangely a Diagram 1/107 21t Mineral Wagon has never been available in kit or rtr form in 4mm/00 gauge, despite kits existing in N and O. I also don't believe a kit exists in any scale for the 1973 rebuilds, which were similar in appearance to the Dia 1/107's.    For the Dia 1/107's, I have seen varying methods of trying to create them in 4mm. These include either cutting down and hashing the existing parkside kit for a 24.5t mineral, or adding extra doors from an Airfix 16t mineral t