Ok, inboard shocks, narrow chassis, and a giro inside so when it turns over it can drive equally as well and the servo is automatically reversed.
To build the perfect car, you must evaluate what does and doesn't work, but the trouble with that is people opinion of what works can be very different.
My suggestion is make it strong, and make it have few consumables. Such as diff outdrives which run on roller dogbones (like some of the Losi team used).
You should really test & form your own ideas, as listening to us crazy bunch you could end up with something completely bizarre.