[quote=TentacleLord]
Because your vehicle weighs eighty tonnes, thus contradicting the use of your claim of lightweight materials, and your subsequent use of an MBT as an example. Things that are splayed out to the side don't work, with spiders being a premiere example. They can't get bigger than they already are, due to, as you already mentioned, the square-cube law.Splayed out legs work, simply due to how weight gets distributed. Like, something the size of a man would be acceptable, but nothing larger than that.
[/quote]

Most of that weight comes from the mech's internal machinery, however I could reduce its weight to 45 tons to make it more plausible and more in line with my overall description. Even still, it shouldn't matter given how the machine in general doesn't exert more pressure on the ground than, say, some of the other mechs in the RP (especially when you factor in their dimensions and sheer scale). Physics isn't really in your favor with something that tall, even if you're using ultra-light materials. 

Keeping in line with overall theme RP, I suggest we get away from the whole 'science thing', like I initially stated a page back. This is a mech RP, after all. 

Also, the legs aren't splayed out. Sachism looks like this if anything: 

[img=http://mechazone.com/blog/wp-content/uploads/2012/10/battletech-procyon-quad.jpg]

I think you're describing a hexapod mech, which is an entirely different shape (though, mechs of this design would probably be uncontested when it came to moving about the Junkyward).