Finished the mounting rails.
I opted for system 20 (2080) extrusions, rather than a solid bar - as I see on many commercial instruments. These extrusions have superior stiffness to weight ratio, compared with solid bars. The end caps are 3D printed ABS.
Another advantage is that the dovetail plate can be moved along the long rail for optimum CG, and thus it does not have to be extra long (and heavy).
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