I recieved the Mk I and Mk IV Plans Packs today. The service from The Tank Museum was first rate. They came in a nice clear covered folder and the different marks had Post It tabs seperating them. The contents are very good too. I got a specification sheet for the Mk I-III, interior and exterior drawings for the Mk I and IV, and even a tank equipment layout for inspection sheet. I recommend these plans and if you are interested contact Tha Tank Museum and they will help you buy a set. The plans do not come with any stated scale but that should not be a problem. All the drawings are in various sizes. This is a big help especially when correting the Emhar Mk IV Male sponsons. So go out and buy a set!