interchangeable steering systems

I have been playing with ways to have interchangeable steering in the car, so that I can experiment with the original system and also with one incorporating Ackerman principles; a pivoting axle and a rigid one. This will be achieved by having bolt-on fronts, the first with a triangular pivot point, the latter with parallel rails holding a rigid axle. In both cases the axle will be sprung on a central spring pillar, like the original. The Ackerman axle will probably also have sliding pillars incorporated with the stub axles.

notes, not art