This video shows the completed bastard crotch system right before we disassembled it. You can see that all of the jack rafters and purlins have been cut into the bastard valleys and that the backing cuts on the bastard valleys have been cut as well.
Rather than mathematically calculating the backing cuts and then getting them laid out on a tapered octagon, we made a jig that allowed us to run a flush cut saw in plane with the top of the purlins/rafters and then cleaning up the remainder with a Fein tool and a sawz-all. This method worked very well and we were glad we didn’t try to lay the cuts out beforehand.
THis was the last major in-shop setup for a bit as now our attentions would be turned to raising the structure outside; this will allow us to cut all of the posts into the floor system and was necessary so that we could ship as complete as possible system. Our underlying goal always has been to minimize spent on site during the raising and it became obvious that standing the structure at the shop was a critical step for us to maximize efficiency on site (over 2500 miles from home)