Sorry? You did me a big favour, I do not need yet another model to add to the queue waiting to be built. I must keep chanting that!

I would not be keen on HS81, even the mg version, the gears are very small and easily stripped by vibration/flutter of the control surfaces. Go up to mini like 225 rather than micro servos.

My only building tip is do everything to remove material and weight. When you have carved the leading edge root extensions look at hollowing them out to remove weight. The planking is a pain, and needs a lot of filling between planks, which is why I thought of 1/16 sheet. I would epoxy glass the model, but I am confident these days of my ability to do that with no weight penalty. I seem to remember it screwing out of loops and I put it down to elevator differential cause by rotary motion of the servo, I might think about a servo per side.