This thing drives at 6 feet per second, until I swap the gearbox for one of my 2 speed designs, in which case it goes 4 and 10.

As for weight, Inventor seems to be having issues with weight (it thinks that a 1x1x1 of aluminum is 8 pounds...). However, from previous build experience, I'm guessing 25 at the most, and that's including the motors and gearboxes.