Well ive been messing with the undercarriage , I know its a weekend kit but the U/C legs were just too bare as they were . I had to add a few vital bits to make them better. I added 2 brake lines to the front leg , and brake lines and conduits to the 2 main legs. The other very noticeable feature of the 21s main gear is the scissor linkage that is attached to the bottom , moveable, part of the leg undercarriage door . I assume on the profipacks its on the etch sheet but mine being the weekend I had to make my own with plastic strip. Ive also added a loop to each wheel hub to represent the lines there . I'll put the pics in the next post as theyre on my phone and im on the laptop now, cheers tony