i don't know about number 3, because my bros 2 speed is almost three years old original from the kit. we race every week locally and even go out of town about twice a year to race the big ones.

but it will be nice to have it light weight (but if it's gonna be weak because of that, leave it as is!!)

about the easy removal of diffs, serpent tried but it's not really just 4 screws that you have to take off. you're gonna end up taking off one of the arms also to take the diff off for the front. in the rear, you will need to take the whole rear carrier and the upper arms.

so i don't know what easy means to other people. but if they were to get the design somewhat the same as the "easy removal diffs" from serpent - to me it shouldn't be called easy at all but almost the same!