A 2.5mm ball driver is best for getting the motor screws in and out. The screws are not impossible to get at with a normal driver but are quite awkward. I think Hudy make a 60mm 2.5mm driver.
To remove the diff covers you need to take more or less the whole top deck off, then 2 other screws, pop the top links off and remove the nut from the shocks. The process is a little long-winded, but it doesn't really take that long to do.