Re: In need of some direction/pointers
It appears that the 20amp breaker is a double pole 240 volt breaker which could possibly be used as is. The easiest thing would be to test this with a multimeter to see if it reads 240 volts. Alternately you could pull the breaker to see if the panel is constructed such that it allows both 120 volt line feeds to hit the 20 amp 2 pole breaker. However as you don't have a lot of electrical experience I would recommend that you get a qualified electrician to look at it for you.
I'm not aware of any insulation panels that you could use internally. Perhaps you could attach something like rock wool to the outside without covering it with sheet metal.
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