You can probably add:
#53725 Tamiya EVO IV Carbon Body Mount Stay (as mentioned above)
#53837 Motor Heat Sink for Transverse Motors
#53849 TA05 High Precision Diff - at least one for the front diff if you're going 19T/mod carpet.
I don't think I'd get the aluminum steering, though.. the stock one is pretty solid as it is.. I've noticed quite a few parts are the same material as the chassis, the fibre-reinforced polyamide.
And, it includes 2-degree rear uprights. Not reinforced like the set you can buy, but still not bad at all.
Noticed also that the aluminum transponder stay doubles as a servo mount for one side. You'd still need an aluminum bit for the other side of the servo, although it's reinforced material as well, you may not need to.
And man, easy access to the diffs is an understatement! Pop 4 screws, two shock links and two ball cups, and you're set to go. I just had to do some shimming to keep the diffs centered, .3mm each side.
Went through a few 5mm's to shim the axles as well. Comes with some AW grease for the axles and diff thrust too, very useful stuff.
The tires actually have a bit of traction to them too, unlike the Enzo Ferrari radials.. might be okay for stock carpet racing with the right inserts, or at least rally
Heh.. an extra 23T and shocks, eh? Got the Champ-RC Combo? I just got the stuff individually (w/Ti screws - covered every 3mm screw I ever needed, with one left over
)as well as a sport tuned motor, extra aramid belt and spur (I'm very prone to retard-moments), alu hubs, and blue turnbuckle wrench (a godsend!).. you never know if something goes, you'll have to wait a bit before it shows up in stores in North America..heh..