Dan,
I haven't built your palne. What I try to do is use an extra long 1/4 drill bit or the same size bit as the dowels. When I'm building the fuse I look to see how I can use the long drill bit. In the case of a Four Star I do not put in the landing gear plate or the lower nose planking until I've put the wing in place and used the fuselage bulkhead dowel holes for a guide to drill into the wing leading edge.

You can also do the same thing with a stubby pencil to mark the wing leading edge if it is not possible to use a long drill.

Anyway just a thought.
John