I am hoping that comments do not discourage you from building your rod with cowl steering. There is no mystery to the geometry of bump steering free operation with cowl steering. In these photos notice the length of the drag link in relation to the steering link length. When these are equal they move in the same arc so as the wheel travels upward over a bump the two links move in a identical amount and the tire does not deflect side ways. Can't wait to see next progress photos.