First picture - the wing. Three bits of paint stick - two short ones at the front locate the leading edge, and the one along the centreline stiffens this portion of the wing to take the load.
Second picture - two short pieces of paint stick give a hard wearing surface for the wing location sticks to meet at the front. Positioned so the draught excluder foam on the wing saddle is slightly compressed when the front of the wing is dropped into place.
Third picture - the white foam structure forms a bridge between the battery box and the rear bulkhead. Velcro is hooked under the bridge. Wing saddle has doubler foam added.
Picture four - wing in situ. Front locates under the wooden surfaces, compressing the draught foam. Rear pressed down to compress the foam, and the Velcro strap tightened. Voila.
Idea was inspired by the Ben Harber monster B52 which had a Velcro strap system to locate the removable wing. Nothing new under the sun!
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Sorry about the mud. Occupational hazard for belly lander in winter.