I am now willing to admit that I'll probably
NEVER be finished upgrading this thing!
^^^
Feigao 9XL taken from the Tamiya fan.
BK 12020, also from the Tamiya.
^^^
Mod 1 gears; 36T, 38T, and 40T spurs; 14T, 16T, and 18T pinions.
More to come. Unfortunately.