Just building a second FF03 and here is some interesting information for the techno geeks out there.
I have just started building the gearbox and have gone with aftermarket parts from 3 Racing and Yeah Racing. By adding the following items:
3 racing Top shaft and centre shaft
Yeah racing plastic gears (all 3)
3 Racing alloy outdrives (actually added 3.2g
A weight saving of 5.5g in rotational mass in the gearbox was achieved. Yes it doesbn't sound much but it is rotating mass. Obviously you could save more by staying with the plastic outdrives.