Before adding on to the dome frame, I poured a heavily reinforced ring all the way around the original slab and tied into the new slabs on the front and back. I'm sure I used more concrete and steel than necessary, but it's strong.

On the front of the dome and two places on the back, I disconnected a hexagon (six triangles) on all sides except at the top, then rotated it ninety degrees outward, to form a ten foot high roof over the new space, leaving a large hexagonal "archway" into the dome from the new room.

(The wind blew over the scaffold. It blows hard in the spring around here.)

I next made walls from more hexagons, and then filled in the gaps with customized triangles.

The two back rooms were connected together with a peaked roof, giving me a large kitchen and dining area, and a sun room with a great view of winter sunsets. .

I've been living on site for a few years, so have a good idea of the solar paths. The next consideration was Windows and Views