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There was this internal track/rail system. It might have been rules for making mechs from scratch.....i dont remember.
For example if you wanted a hard point "moved" from left arm to right arm, you'd have a track in the left arm, one in left torso, one in center, rt torso, one in right arm.
It might have been just orgin and destination..... basicly you pay with tonage of the equipment slots or both to basicly move one hard point from one place to another. A "further" move might costs more in tons or slots or both.
Like I remember sometimes I love to have symmetrical mech and some times not, So for example you could swap a laser and a machine gun on your Raven 4x.
) 5 tons.... in some cases a person might say well its not worth 5 tons. 
