Hi,
This might be standard practice, but as the root edge is quite fragile and prone to little chips in the paint I have run a bead of fuel proofer varnish around the edge.
Regarding the donut for the front location pin on the main wings it was suggested that they are secured with screws rather than epoxy in case I want to change the wing incidence.
24 flights so far. Very stable on a windy day.
br
Tom