Not many people using copper for plumbing anymore, even through it’s still the best.
I think block walls are cheaper than stick frame at this point.
I’ve got lots of oak trees. I ought to make a sawmill.
Portable sawmills are the big thingy nowadays...............
Copper is still used in wiring..................
Nothing wrong with using sawmill timber to build a house except the building industry convinced the Building Code Council to recommend only graded and stamped lumber be used.
Municipalities adopt their building codes from the BCC and now a majority of counties require graded/stamped lumber for structural components.
Damn the bastards.