RE: How to make a Q500 wing??
There are many ways to skin a cat, but for a 428 wing...
I use 3/32 skins for the top surface, and 1/16 with a .007 x 1/2" carbon fiber strip glued to the inside surface of the lower skin. Both skins are 7 to 8 lb. stock. The CF only needs to be 30-36" in length on the lower skin only, none on the top.
With the higher weight standard now in effect, you can use 3/32" skins top and bottom.
A spar is not needed, but glass the center section with tapered layers of 2 oz cloth, wider at the front of the wing.