If someone would give me a good answer I will sell it for $10. Just kidding. Yellow's website lists
Plug in Wing Spar System (2 pairs required)........................................A 2001LW

Maybe I should get a copy of yellow's plans and see how they do it. Then see if the JMP structure will support the plug in wing spar. I have a dynamax and a os 91 df that will eventually go in the plane.