Reviewing the available materials and looking at what has been learned over the past twelve months, I figure that it's worth another shot.
Accordingly the plan is to build a half-scale model with an underslung and overhead drone, for which I've the dummy and sheet material for the lower quad.
This will provide lift only, so as to render the payload near-weightless. In theory this should allow for a commercial off-the-shelf (COTS) drone of proven functionality to steer the airframe from overhead.
This in turn means that the 'pilot' drone might be altogether smaller and less powerful although the propeller axes might still need to be extended coincident with the lower (and much larger) set in order to provide sufficient moment.
Once more unto the breach, therefore.
And reinforced now by Pfizer-BioNTech's Covid-19 vaccine, what can possibly stop me?