I will presume that you have never built a 2 piece wing before. If this is the
case then I would suggest not doing it for your 1st try.
If you are intent on doing this modification,then I would suggest that you buy,
beg,or borrow a set of plans that has a 2 piece wing design and then study them
carefully. Then you will have a better understanding of what must be done.

BTW, I also have a Dynaflite Fly-baby and it's a super enjoyable plane to fly.

Regards
Roby