Framing has begun! And moving full speed ahead.
As you can see, Chris is approaching it like cabinet making rather than rough framing, as the dimensions and fit are more important than typical.
Also, not using a level as a reference requires precise measurements as there is no way to “get back on track with a level” to fix any sloppy cuts.
Note the 8.5×11 format construction drawings floating around — great tool for both builder and designer to see eye to eye across space and time!