What I find interesting about your GRUNT design is that it falls prey to the same mistakes as the Space Shuttle. All the different parts would make it expensive to produce and upkeep as well as greatly increasing the danger of spontaneous failure. On top of that the amount it put\'s into orbit is not that great for it\'s cost. A spaceX like vehicle with identical parts for decreased manufacturing costs would be much more efficient. But I know your just doing it this way for a challenge and because you end up with ludicrous space launchers Keep it up!
