I'll look for the stats, but a couple of friends and I built a 1000 Ton mech. I know, it is not within the parameters, but we had a lot of time while in high school and worked out the specs on it. I'll have to look for my custom folder, it disappeared when I moved...
Unfortunately all those sheets are roughly 5000 miles away from where I am right now, but I fondly remeber a Awesome that we got gutted that we tinkered back up not with it's three PPC's, but with what we had... extra heat sinks and small lasers.
She was a real knife fighter range mech that we used as a ambush artist. All those small lasers built up so little heat that she could carve up an opponent like a joint of beef firing every one every round without building up any heat burden. Too, there are all those extra chances of getting a critical effect with all those little buggers blazing away and the armor on an Awesome means that it can stick around to hang and bang at that range with just about anyone not vastly up-teched. We even took out a pair of Vultures with the little lady in one fight where it was hiding in a small apartment building at the beginning of our first encounters with the clans.
Fun times man.
Drax-"There times that try the soul, times that try the man and times that try to try a man's soul."
Kellin-"What does that mean?"
Drax-"Nothing. But it kept you occupied while the summoning was completed. Now, look behind you... and dispair."
I have an upgraded version of my Clytemnestra 'Mech which appeared in BattleTechnology #20 waaaay back in the olden days, alongside a 100-ton Arena 'Mech called the Night Terror, a nightmare of claws, large pulse lasers, Streak SRMs, and jump jets.