Alex said:
I'd prefer plastered stone walls.
You mean stone as in brick (bak-"steen") or concrete block? I know that's the standard wall material in The Netherlands (I'm from there originally), but in North America it's very rare. When I first saw houses being built in California, I couldn't believe my eyes. They just nail together these little matchsticks, plywood on the outside, sheetrock on the inside, and that's it? As for roofing, the typical material used is similar to what my dad used on the chicken coop back in Limburg. Everywhere except Chicago (for some reason), electricity is run as cables that simply go through the voids in the wooden walls. What? No conduit? Nope.
But it can be useful to keep in mind the other possibility: maybe the Dutch just massively overbuild their houses. When I tell people here about the double masonry walls ("spouwmuren"), plaster walls, concrete floors on each level, fully tiled bathrooms, and so on, they are just as incredulous as I was when I first saw American matchstick houses go up. Besides, in some places, there is actually a good reason
not to build our way: earthquakes. Okay, earthquakes are no excuse for using painted drywall as your bathroom walls, but they're a very good reason not to have brick walls. Wood, being flexible, holds up much better. If you're in much of California and you insist on brick, you'll have to either go for brick veneer or reinforce your brick wall with rebar, basically.
Now as for this guy's shop... fire codes permitting, if I got to choose I'd prefer something I could attach reasonably heavy stuff to anywhere without worrying about finding studs. Plywood will do that. Or you could use wood boards, if you have time on your hands. Lumber Liquidators sells something they call "utility oak" that is not to different in price per square foot from construction-grade plywood, if I recall.