Chassis Rebuild

While at work i've been thinking about the chassis rebuild. I've been playing about with the idea of a bolt on front subframe. The idea is that it will make it easier to jig and build the chassis, but also make future repairs easier, with even an option of a changing the front end in the paddock if needs must. My biggest dilema is whether i should try and frig with the geometry to improve the handling or just copy what is there. My suspension design skill is zero, so i just worry that by trying to improve it, i will ruin it!!! At the moment i have knocked this up based on the standard geometry (this is WIP and has plenty of detail still to add)