My pitch might be along the lines:
Also requires adequate tools, otherwise it would be like having bullets without a gun. But a sensible referee would include that. Just makes the game more slick, if the writers mention it regardless.
Repair duration should not solely be dependent upon character intervention (Eng or Mech check). Should also factor in the severity of damage as a DM sort of thing, when calculating duration of repair. As the Repair rules stand, it looks like Severity is only used to influence the number of spare parts required. Really, Severity implies number of spare parts, and number of spare parts plus character intervention implies duration of repair, IMO. Or did I not read that right?
3D printed component part(s)? Or even a jury-rigged, frankensteined, or cobbled together solution(s)? Might take more hours than it is worth, but if there is a will, then there is a way ...