Boat Welding

[cu_chullainn]

Hi Im thinking of Welding a boat together. I used a mig welder before in autobody school. Would that be a good welder to use for that. What type of that welder would I need. Im going to make it into a katamaran style speed boat. With an airtight roof.

I shop at Canadian Tire alot, would any of those be good. Thanks in advance.