The mods I am making to the wings of my Katana 50 are as follows:
(1) Add carbon fiber brace behind main spar, epoxied in, as shown in picture
(2) ditto to part of rear spar
(3) Add balsa blocks on either side of slots for aileron hinges (just visible in the photos)
(4) Add pinned-hinges (Great Planes medium nylon) epoxied in
(5) repair LE sheeting
(6) possibly add some 24 g/m2 glass fiber cloth to some parts of the LE balsa sheeting.