Four-way connectors pay dividends at each corner of the airframe in the event of both octo and quad builds. In the case of the former then provide a nearly coincident locus for mounting contra-rotating propellers. For the latter they allow for the airframe to be leaned up against the garage wall when not in use ~ without damage to motors or propellers ~ when disconnected from the passenger cage. As the airframe is scaled up in size, this becomes a practical consideration.
Nonetheless as such connectors cost over a fiver each ex-VAT they won't be appearing in the forthcoming studio shot, thank you. Stubs included as seen here on the current airframe (featuring 750mm perimeter bars) would extend its foot-print to around 36" square, as against a smidgeon over 30".
