and move the electrical boxes out or add an extension to them (available for just that purpose) but that should be about it. Full insulation in the walls should make life a lot more comfortable! It's not a hard project. Depending on how thick the new drywall is you could find stock trim like screen molding or door stop molding that would space out the window and door frames without any custom ripping of wood to size. It would make the finish trim work a lot easier and quicker. A quick coat of paint and it would look fine.