Hi, Thanks a lot for your input and pics. BUSA kit has no tubes linking the two wings, only dowel sticks built into the two wing section for guidance when assembling the wings to the fus . The struts under the wings are fully operational. Also the canopy top is see-through. I Notice from the top view of your plan, there is one cross-brace inside, is it dowel, aluminium - welded?
Regards
Alfie