I'm getting ready to rebuild my shop by extending it 9 feet in length, bumping the 7' ceiling up a foot and installing a loft for lumber storage, and changing the roofline from 2/12 to a snow-shedding pitch. I'm biting the bullet and having the roof insulated with blown-in foam, but will be doing the walls myself with fiberglass (probably). Right now the walls are made with 2x4 studs. I was thinking of adding 2x2s on the inside wall to give me the extra room for insulation and wiring. Living in northern Vermont, it gets a bit chilly in winter. But like all structures, most of my heat loss is thru the roof, so I want to make sure that's done right. But is it okay to make a wall thicker like that? Not for load bearing, just to give room for wires and more insulation..?

Also, It's a shop. Doesn't have to be pretty on the inside. I was going to drywall it, but it seems wood would be a better choice for durability and ease of hanging stuff. All advice is appreciated

Pete