i don't know much about military projects but maybe i can help you with some suggestions. anyone know about the german p.1000 and p.1500 landcruisers? they never even became prototypes because of their sheer size. the p.1000 "ratte" was supposed to have a cruiser turret and the p.1500 "monster" was meant to be platform for the Dora railway cannon. suggested reading would be a book i've heard about called "my tank is fight". it's not available yet but will be released in the next few months and introduces a few secret projects of the ww2 era. i'm sure you can find information on the forementioned projects and a few more if you use a search engine if you can't wait for the book to be released. maybe you can even find something interesting in your local library but don't count on it.