Very nice video TF, good find that man!
Some interesting features there, namely that suspension, clever little idea that, darius makes a good point in that it would help a tank in a hull down position, although as with all good ideas, I do ponder how easy to maintain it is. After all, it's all well and good building a tank with pimped out features but if it has the reliability rate of the early Tiger II then it'll only be useful as a wall.
I like the submarine feature too, it's not the first tank to do that, IIRC I've seen at least one other tank display those characteristics, however it's the deepest I've seen one go. Sod being in that should it develop a leak...