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Stephen,
Your comment:
When the scope rotated the camera changed position relative to the center of mass of the front cage and the front half of the truss moved in a slightly different direction to the back half hence loss of collimation.
This is what the Serrurier truss is all about.
The mirror cell, centre section and top ring must be rigid enough that there is no distortion or deflection.
The stiffness of the front trusses have to be matched against the back mirror cell trusses.
IMHO the problem comes down to the choice of material, section sizes and deflection calculations. Not additional weight or mass.
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