JT, i put this on project hold when you were working on your oven. i was ready to buy a FB dome back then and decided to look around. yours seems to have worked out great in the end.
ZaMan, the dome has three layers of ceramic blanket with chicken wire on top to hold it in shape. the next layer is a mixture of pearlite and portland at about an 8:1 mix. it's certainly way lighter than concrete but i still used over 200# of portland. that will be followed by a stucco finish. i'm afraid there's nothing light about this project. i did get a "before" weight on my truck and trailer. i'll know before long the total weight of the trailer and the weight added to the trailer. it may take low range to move it!
so far i know this much: the oven shipping weight was around 800#. i probably put that much more into the stand and concrete layer. i'm guessing at least 3-400 more lbs on top of that, not counting firewood, tools, tables and pizza dough.