I think this one can be shared here ...
It started as a classic Tamiya FF-01...
And I wanted to push it a little bit further, so I started with some mods on the gears ( new spur gear, to get a lower final ratio and get a decent speed with 13.5 and 17.5 motors, I also replaced the differential with a TA-03 differential wich is more resistant than the original one, and finally, I found that the problem was also the weight distribution, so I wanted to try something different...
Chassis is made of 3mm aluminium, top plate out of 2mm aluminium, I can put the servo in the same position than with the original FRP chassis or on top, batteries used are super shorty's, or normal shorty's, a normal lipo pack can be used too, but can't be fitted lenghtwise...
I didn't test a lot, as I'm on other projects now ( new house ) but I get much more front grip, steering, and acceleration out of tight corners...
I didn't make the parts by myself, I just did the design, or prototype parts, some friends did the rest ( so if anyone wants some parts, I can give you the usefull contacts )