[casper] ROACH 2 Mechanical Drawing and CAD

[Vaughan Moss]

ROACH 2 Mechanical Drawing:
https://github.com/ska-sa/roach2_chassis_design/blob/R2_rev_6/ROACH_2_CAD/roach_2_hardware.pdf

ROACH 2 CAD:
https://github.com/ska-sa/roach2_chassis_design/blob/R2_rev_6/ROACH_2_CAD/roach2_asm.stp

Regards
Vaughan