I think any series and parallel configuration is possible but,
if we expand too much the number of engines we find two problems, first space,
for besides the engines each carry a driver and engine cooling for each and every driver,
the motors are oil-cooled everyone needs a flow of 12 liters / minute, drivers are cooled glycol,
two different circuits, one engine and one for the drivers, the second problem would be the batteries,
finding space and cooling if necessary, if we use a voltage of 400V each engine provides 120hp highs,
and if we use 700V each motor generates a maximum of 221hp,
so if we use 2 sets of 3 motors have 400 volt 720 hp highs, and 700voltios have 1326 hp