+1 strawbale.... especially if cost is a factor... but ESPECIALLY for a studio..
those wide bales make great insulation/isolation... i wish i had gone strawbale with my recent studio build (half way through my friend mentioned it, and i replied "that woulda been sweet, what the hell was i thinking!" too late for me )...
although with a loft style building it is mostly roof anyway (A-frame?)...
another good idea especially up north might be ICF walls (insulated concrete forms) .. they have many systems that are lego-ish (building blocks) - that even a semi-competent person could assemble .... also another good choice for insulation/isolation
gl
