Regarding build table weight and skipping teeth - this is a mass independent issue. A heavier table will require more force to make it skip, but you also end up with higher acceleration forces trying to make it skip. Increasing or decreasing the table mass has no affect on the peak accelerations you can achieve. The primary factor in determining skipping is the pressure angle of the gear teeth (we use 20 deg. pressure angle pinion gears). With a 20 deg. pressure angle the maximum theoretical acceleration is well over 1G (9807 mm/s^2).
I wouldn't have even considered this an issue. I love the idea behind the new technology that will drive the MOD-t. It's brilliant. I'd like to know which one of the New Matter people came up with the idea.