HI CGCINC
I can tell you my PM256 came with a cord attached and a separate plug.  The plug I did not use as it was not a standard welder plug.  I bought a welder plug and receptacle from Home Depot. As far as making your own extension cord here is what I did.  When I built my cart I attached the extension cord to it with two receptacles there.  This allows me to have my tig and mig welder on the cart plugged to the cart.  I can now wheel the cart around my shop or outside and use either welder for a project. You will also need to attach your gas bottles on the cart too.  Use big back wheel where the bottles are attached.  Put a draw on it for you consumables, collets and cups ect. Look around there are many different carts that have been made pick one that fits your needs.  Some have a water cooler attached too.
Have fun
Tom
				
			 
			
			
			
			
		 
			
			
			
				
					Last edited by acourtjester; 10-22-2011 at 03:56 PM.
				
				
					Reason: spelling
				
			
			
			
				
			
			
				
Everlast PM256
Millermatic 180
Hypertherm PowerMax 65 with machine torch 
Longevity Force Cut 80I
DIY CNC table for plasma/routing
13" metal lathe
Small Mill
ect, ect.