Me also sorry for F wing, I mean front wing.
Now I know what "bog" is though never seen it here but will find or mix myself.
We have made many F and B wings over the years and now are finding more surface area and thinner flies great.
I have one that was flown last summer and is well liked so I want to reproduce it without the incredible amount even using power tools to shape mostly the underside.
If my camera batteries are charged now I will post a photo.
My latest idea since my last post here is to "hollow out some extruded polystrene say 1 cm deeper than wing profile and then fill with clay to get to the center of both the Leading and Trailing edges.