I added ailerons to the uppers this way

At the trailing edge I sliced the lower ribs to allow a piece of flat stock underneath. I sliced in the upper trailing edge for a length of triangular stock (normally used for the T.E. for a flat-bottomed wing). I shortened the ribs just enough that they butted up nicely to a pre-formed solid aileron stock. The uppers are slaved to the lowers with trailing edge rods so only the lower wing has aileron servos, but a beefy one (69 oz in) on either side. I also thined the entire airfoil of the upper wing based on talking to a BUSA90 pilot who did it (following the attached article he passed along to me).