I actually got it closed. JUst had to run 2 core wood beams up to the center. Then my fire went out. Amazing, cause its a high ceiling and lots of huge windows everywhere for smoke to leave.

I had to remove half the circle I closed. Then fire lit again. Have to see if rain puts it out. I have a ladder I kept that can reach top from inside to tweak things later. Building is so much fun in this game. Some genious should make a program that tests out structure and smoke ventilation before you start on a project. Still fun.

Going to try putting fire along wall. If I place a panel above a window and the fire, the smoke should deflect off that panel and vent outside. Something to try.