The system to join EO has been described in the 'EO Stacking' post, here are pictures showing an EO Fokker plane assembled.
Note how the spars go on one side and the shock corded end cap opposite to clasp the intersecting planes of the wing center. For the front three plane intersection it is important to make the shock cord go around the bottom part of the center plane oval as this locks the spar to the center line.
The system is designed to be robust by having some give in times of impact, and sometimes may need to be reset if taking too many nose dives.
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