Disclaimer: Ok, I was never cool enough to play Battletech or D&D back at school...lol...but I've always loved those old-school mech designs. I tried a few recently on a small scale with mixed results, (see below). I'd love to build some minifiug-scale ones but for some reason I always fail at them; the legs always give me grief! Anyway, see what you think of these, I've ordered them from best to worst :)
Your last one looks like an old school "Cyclops" assault mech to me. More importantly, so what if you didn't play Battltech back in the day. Play now man! Heck, I haven't run a Battletech campaign in nearly a decade but still have all my stuff neatly tuck away in boxes patiently waiting the day when I find a new group. In fact at least with these guys you can blow em' to bits and scatter their remains all over the battlefield. I say go for it just like Phipson said.