I just bought a Syncrowave 180 SD. It weighs in at 240lb. I already own a millermatic 251 that weighs in at 214 lb. Plus my accessories, spoolgun, wires, inverter style plasma cutter and blah blah blah. Lack of space in my shop and common gas tanks means these are getting stacked. I already has a nice factory double tank cart that came with my millermatic. My question, should I build the frame onto the millermatic's factory frame or build an exoskeleton frame around the millermatic to hold the syncrowave and plasma, therefore transfer the weight to the base cart?

Also has anyone hardwired their units together so there is only one plug for the whole apparatus?

This is just for the frame work, I plan on have drawers and cubbys and holders.