The final wall that needs to come down, mud and rocks along with the odd brick, the main brick section is the recess from the other side where the electrical (wooden) fusebox lives, which will need moving slightly.
Its been fine for 50 years, but It needs some attention.
There is wind-driven rain coming in next to the big window, so that needs attention, but that's not the major concern.
And follow the edging board back to the right, you will notice another 2 nails which are in thin air.
It will require beefing up, I can't believe this roof is still up with the weight of snow in the winter!
Oh well, onwards we go! :)