Great idea on the weight! And I certainly give you credit for modding your Tyco, you don't see a lot of that. It makes sense due to parts scarcity. A brushless Turbo Hopper would be destroyed in a fast crash, not to mention the strain on the tires and gearbox. A boat, however, would really be able to take advantage of a brushless system.
I'm actually looking at buying a used Tyco boat, just something for the pool, it's good to know these old models still hold up well!