[AngryData]

If it is a standard type of wooden stud home the engineering skill is basically nonexist just by following general framing patterns which haven't changed much at all in around 150 years except for not balloon framing studs across multiple floors and instead stacking floors on top of walls. Framing and layout design is probably the easiest part of building a wood stud home. Once you know how basic floors, walls, and openings like doors and windows are built they will all fit together in any combination you like and be more than structurally sound because the basic design is seriously overbuilt.

I think most people would run into the most trouble trying to follow code with electrical, plumbing, and HVAC. You can frame 95% of a house the same way as a 120 year old house, but if you go beyond 15 years then all those utilities have had constantly evolving regulations and design constraints and just because you saw it in a dozen other houses doesn't mean it will pass this years code.