Decided to just upload and comment on this. Your mileage will vary, it's just how I did it.
img 5501 - I used a plastic sheet with epoxy colored black for all wing mounts
img 5516 - i found a carbon block like this was the most secure method to mounting the servos both flush and rigid. I tried wood mount, even with ca in the holes they wear and wiggle over time. carbon will not.
img 5518 and 5519 show the curve surfaces of the wing mounting surfaces. I found if I flattened the fusalage side the fit was better, the tape holding the wings worked better (prior to this, I needed to retape the wing if the landing was a bit firm)
img 5522 shows some of the sanding to see what I was trying to achieve. I found a lot of carbon here, so go for flat and good fit.
img 5537 is the rudder layout for the servo horn. those sideway v's is all I cut of the carbon and maybe some of the foam. I did this type of cut/fit with each servo horn on all surfaces. I did rough up the servo horn, and notch them slightly for increased grab, also after I cut the carbon of the v's in the image, I also removed the rest of the tape under the servo horn and sanded that as well.
Image 5558 is one of the wing surfaces and the servo hone sanded, notched, etc.