All the blither in the patent application was just to create a fog of difference in attempting to patent an old concept.
The Atkin folks used both reverse deadrise and box keels at the end of WWII.
These were published as plans in Rudder and Motor Boat in the 1950 era when folks might build a boat in their back yard.
The Seabright Skiff is known for efficiency (as well as being beachible) a gent named Rob White built an 18? ft version that got over 30mpg , at speed.
It was a version of the Rescue Minor .
The reverse deadrise does keep the boat level at slower speeds than pure plaining would.
Remember a boat really does not squat, it simply follows the water surface as it attempts to climb up and on top of its own bow wave.By pressurizing the stern to lift the boat stays level , so the boat begins to ride on the bow wave , and not climb it at a steep angle.
There is also some efficiency gained by the prop being parallel with the water , and recieving already accelerated water from the flow from the box keel aft.
The effect seems to peter out at over SL 2.6 or so and at SL 3 a genuine plaining hull is considered better.
With modern materials and todays light weight engines a more efficient cruiser that could go 12 --15K , burning 3 -6GPH GPH rather than 15GPH should not be hard to do. DL>100.
Perhaps tho the boat would have to be sold outfitted as the Huckins were , everything is aboard as sold , to prevent staggering weight increases by owners.
I looked into this as my first choice for a box boat , a cruiser to be shipped inside a Sealand container , at far less cost than actually motoring to the destination.
New England to down under , fly over , un box the boat and cruise away.
Yes the boat would be slender with about 7ft 6 in beam , but at 39 ft should be comfortable for a crew of 2 or 4 to explore new places ,even for months..
My concept is to have just the hull built , and install a used car engine to actually measure the performance.
If its crap, sell the hull to fish guys .
If works as well as Atkin claimed , the boat could go back in the box to have the interior and the rest installed.
The stability would be augmented with a center board style lowering , powered stabelizer.
Even cruising in the USA , where the USCG has given up the water to state and locals who install moorings in THEIR waters to rent , there is plenty of free space for a boat that doesnt mind a few hours aground during the visit.
The narrow hull would provide a superb seakindly ride , with a bow cockpit (Midnight Lace style ) the boat should be a very enjoyable cruiser.