While it unlikely that we will be able to use 6 cims next year consider this, a 6 motor drive train with 4 cims and 2 banebots(775's or 550's). 973 used them(3 in each gearbox) until the 775's started shorting out. There are quite a few teams that have used 6 motors in drive. 8 motor might require another stage of gearing.
148 has done
this(6 motors in 1 gearbox).