Nice car, nice build pics and yes, I want one.
Does anyone know the size (ID and cross-section) of the shock O rings?
If so you could start experimenting with ones of a slightly different size, shore hardness etc.
I get my O rings from bearing shops who always tell me there is only one type of silicone O ring available in a particular size but having just built a Schumacher Supastox it comes with different O rings which are different colours so these are available if you speak to the right person.