I didn't realize you were still working on this, I was the fellow on another video who mentioned I built one of these on commission for a customer. I know it's a little late, (but not too late), but i would seriously consider using an 1-1/2" aluminum wing joiner inserted against the spar, the strength of the wing and spar system is not very good, and especially since your using a turbine. I was able to inset it using cut out access holes in the root and through the servo bays using long self made tools to lay in fiberglass cloth tying it to the wing skins and spar with West systems structural epoxy mixed with fumed silica. Something to consider. those struts are useless in compression, and the wings could rip out of the wing roots with all that flex. Just my thoughts. It's a heavy airplane.On the hinges I used brass tubing to line the hole and they extended out to the hinge line. robarts glued into the brass with hysol. all roughed up for a good mechanical bond. Your method looks very good. but a lot of work. But that whole plane is "a lot of work" :)
Unfortunately I’ve kind of stopped on this project been busy building other airplanes. So I really don’t have an answer to your question about the flying weight
