Looking forward to seeing your "twist"...
I would encourage you to do some more fires before finishing the dome even the BSF.
If you got 750 go for it and get it to temp, it takes a lot more than you would think the first couple times.
You want it completely happy or there may be some movement yet resulting in more cracks...
I made two render coats and hopefully have all the minor cracking out of the way so the last two can go on.
I will be posting soon on both the build threads.
It finally warmed up here but now have only had four days or so in a row without rain.