You dont have to!
get the car built to a worthy standard and hit the track! get a good set up and make it better that way.
you dont have to improove things by re designing the car.. a set up is a big change in its own right. The car looks as though it has a good weight distribution, and could handle with some work.
You can only make it better with track time.. get down to the track and start playing.. that's where the fun is to be had.
There are pleanty of people to help you to make it better, ask a question and an answer will be given.. if you want the car to do somthing.. ask.. and people can give input on what to do.
It's even better to do this at race meetings.. as it always gets done there and then.. I'm so appreciative of the people who helped me out at tivvy, i normally do everything my self, but with asking peoples opinions, it made my weekend.