In the preferred embodiment, the flat panel spars are designed with a series of imbedded nut elements in the receptacle that serve as “internal tooling” to provide a positive stop for locating the lower skin, as well as {HEAD ~ a means} for clamping {TAIL ~ the lower skin} to the upper assembly during the closeout operation 
for clamping
In the preferred embodiment , the flat panel spars are designed with a series of imbedded nut elements in the receptacle that serve as “ internal tooling ” to provide a positive stop for locating the lower skin , as well as { HEAD ~ a means } for clamping { TAIL ~ the lower skin } to the upper assembly during the closeout operation
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