Been working with the structural portion of the design for this thing we’ll do next year. It has an interesting layout, with things I haven’t done before.
The main floor has a 2200 sf footprint, and the 800 sf second floor sits atop. Because of an open floor plan below, there are places where the second floor and its roof above need to have loads picked up by long span beams. One of the conditions requires a transverse beam beneath to pick up loads so the carrying beams above don’t have to be larger.
You can get the flavor of it by viewing the attached pic. The plans call out sizes of members, but the original house was built over in Vermont, where they don’t require seismic considerations in structural work. I am rechecking for seismic zone 2.