To connect the top ball joint I'm cutting a circle in 15mm thick plate and welding it into the top of the strut tube. Probably having a narrow cut out in the side of the tube for access to the nut on the bottom of the taper pin.
I might incline this circle plate so the ball joint sits closer to vertical.
I have worked out the SAI from the book to be 11 degrees. And the ball joint centre distance to be something like 200mm. So I'll use those dimensions with a caster line intersecting the stub axle.
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