[Jarren Harkema]

I have worked a lot with LEGO technic construction, even tried my hand at this a couple of times. 24t gears between turntables was promising. You will be putting way to much stress on chains. The key for all of this is to support the gears as best as possible. Your module is nice and compact. The only recommendation I would have is replace the 3-long axel on that 12t with something to run the full length between the two 3x5 liftarms. This will keep the 12t from skipping with the 20t, attached to the wheel, as well as prevent the driving gear from falling off its axel.