Hi DW, that sounds like it was fun!
Definitely a good point about insulating the base. Will think about that.
As a kid, it overlapped about 11PM to 2AM before the fire department left. The top two feet of the bottom floor were black and no ceiling could be seen, and when FD came on the scene, they used their giant fans and aired it out. It was monstrously cold out at the time.
When my eyes got heavy, I went to a room in the other side of the house and fell asleep under a pile of blankets.
Wish I could sleep like that now!!! I do remember seeing smoke coming out between the plaster walls and trim and thinking that looked unusual. Not unusual enough to stay in the room and watch.