After researching the actual Big Bertha gun, found that the kit is wrong where the ammunition winch is placed. The winch could not be cranked so close to the rear platform, it would hit the ladder. There were a lot of missing rivets, over sized rivets and missing bolt detail. Also the winch drum is poorly detailed with ribs instead of a coil of cable that should run under the main platform to the boom via a pulley system. The directions if followed exactly will make assembly much harder, especially when assembling the wheels. Maybe my kit was different but there were so many seam lines and pin marks to clean up that it was labor intensive. Great subject, but not for the beginner or the person who wants a quick build.