Ok, so I don't know if this is crazy, or insane, or maybe even slightly delusional . . . or whether it may, in fact, be a stroke of genius . . . but anyway: here it is. "You know that time you bought a STD 400 engine by accident, (instead of an XL400), and you refused to sell it because you're a hoarder and you don't get rid of anything that you might possibly be able to put to good use eventually . . . you remember that? OK, well, here's your chance." I honestly don't know whether this would be absolutely useless on the battlefield, or whether it would actually annoy the enemy enough to be useful . . .
Well, the STD400 is obviously complete garbage, but if said unlikely occurrence did happen, you could swap for 3 MPLS or maybe even 1 ERLL so you can atleast do SOMETHING outside of 100 m... 75 isn't exactly fast enough to use small lasers as your only weapons.
Oh, I know it! And for the record, I don't own a STD 400 . . . it was just a gag. But I honestly do wonder how effective a 'Mech of this size would be running at 75 kph (as fast as most heavies) with some half-decent firepower. For example, here's another variant with that STD 400:
Keeping the essence of a STD400 zombie. Don't take armor off arms, the massive arms are there to shield the torsos. Reducing the armor actually makes the mech more vulnerable.
Hunchback? This thing is like what happens to your Firestarter jailbait cheerleader in 20 years... big, fat, slow and with saggy boobs.