Frank:
Sorry about the delay but I managed to delete all the photos I took while uploading from the camera..pot verdomme! But have them now.
What I was trying to say was to make sure that you have your fixture set so that you can repeat the arm with reasonable accuracy..locking that center sleeve for example, but also having the flexibility to move it rearward to add more built in caster as sometimes there is not sufficient travel within the mounts to accomplish this...I am posting a photo of my fixture, and it has a slider on it to accomplish this.
Also, I use a monobolt in the top of the upright...the photos I am sending show a plain bolt for now on a new chassis we are constructing, but the idea is the spherical part of the joint can be raised or lowered to change swingarm length and therefore roll center. Also using a rod end at the steer arm, which can be spaced up or down is helpful in resolving bump steer issues.
I think it is great that you are fabbing your own stuff, its much more satisfying than just buying and bolting up, and I look forward to these kinds of posts.
Keep up the good work
Cheers
Phil