Here, you could just barely talk yourself into using it … While Repair and Rearm existed. :-]
I suggest buffing CASE greatly; As in "legs and head aren't better then a side torso with both CASE and an XL."
To me, that would mean the internal structure would never take damage from an explosion when CASE is present; What would happen is you lose all the ammo/ explosive(s), and the rear armor, of said torso.
This CASE wouldn't help with an explosion in the arm: I'd suggest fudging up an alt-CASE thingie for that (hint-hint).
The Clan Tech model of "normal" CASE would work in any location, preserving the internal structure and front armor, but not other explosives. Touching off one of two ammo crits in the CT would remove all the ammo, and rear armor, but nothing else. Touching of the one ammo crit in the head just removes the ammo (the only armor in question is already gone). In both cases, the 'Mech lives …
CASE II, when it shows up, would only let the one crits-worth of ammo blow out, while the rest remain, sans rear armor, as per above.
Then again, I don't know how crits work in this sim …
