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They were both from Shapeways:
AMPro transmission brace: https://www.shapeways.com/product/G72GAY3NL/transmission-brace-for-tamiya-rc-cw01-lunchbox
Chassis brace: https://www.shapeways.com/product/E3R2ZC2JL/cw01-chassis-brace-front-lunchbox
They're both a bit spennier than they should have been, and in retrospect I could have made a stiffer chassis brace from a bit of alu, but I was getting some other stuff at the same time (and getting carried away!).
You need to remove the springs from the rear axle mount when you fix the transmission brace.
Looks great, would be interested to see the 3d printed bits and the anti-slap braces.. My wee fella had one a few years back.. great fun