An air gap structure and formation method for substantially reducing capacitance in a dual damascene based interconnect structure is disclosed. The fastener assembly may include a retainer adapted to fit at least partly within a track slot and a rotatable handle operating on the retainer, the rotatable handle being rotatable between at least an engagement position and a release position. A configuration is determined for one or more network-access components in the given coverage area of the wireless network cloud system in response to the estimated density metric. A method for coextruding the foams is also described.