Mechaton Rules Bitz 4 - Alternate Chassis
Power Armor - Power armor uses mech technology concentrated in a suit worn by a single individual, enhancing their motions with incredible strength. Power Armor gets only 1 white die and can 1 attachment.
Spookbots - Actually, the spookbot chassis is only 1 of several designs that emerged before mech technology became widespread. Spookbots may be piloted or robotic. A spookbot has 1 white die and up to 2 attachments.
War Machines - War Machines refer to the vast variety of non mech enabled machines of destruction. War machines get NO white dice at all and may have up to 3 attachments. A war machine without a movement attachement cannot move.
I'm not sure this adds much to the game as written, but it could be a source of fun.