Just finished the new Schumacher Cat SX3 now, it has great finishing, however, some of the "standard" parts in SX become optional parts now.... The most tricky part is the power lines from ESC to battery, but it is done now! Enjoy!
Cat SX3 came with plastic parts, but Cat SX came with alloy parts:
1) standard alloy diff adjustable part (U3339 X 2),
2) Standard alloy block susp set (U3556 and U3517)
The above two parts are the ones that I can quickly identified... but then, SX3 is a bit cheaper than the original SX...