I see you’ve broken things down into nicely specific categories…
Might I suggest the following:
Mods (regulated)
Mods (mechanical)
Mods (hybrid)
A. It puts them side by side (rather than away from each other)
B. spelling it out will save most newbies from having to ask what mech stands for. -not so much the younger Mech Warrior generation, but the older “my phone still has a cord” generation.)
C. You forgot hybrids. ;p