My garage is usually pretty quiet save for a radio which is why the noise of the welder stands out so much

Using a 2 quart reservoir you would definitely need a heat exchanger which is why I went with the go kart tank. At 7 quarts it should be fine but I'll keep an eye on temp rise just to make sure.

My current line of think is to just mount everything on the bottom shelf of the cart and then add a wall to keep the foot pedal from knocking into it.

I'll be happy to post the build up once the parts arrive i you guys are interested.