Jason-thanks
Thanks all for the posts.
GWH74-I have thought about your lower arm.
As I have made and tested a long series of extended lower arms, I can predict how it would work in the crashes. What is going to happen without triangulation of the extensions is that a bump to the corner of the car is going to push the arm back and make a parallelogram out of the extensions. The rectangle formed by the extensions will be squashed. What this does on the track is, it tends to kill the caster and the car will almost refuse to turn with that particular front wheel until a repair is made. A rectangular sheet glued in would prevent this.
John