My scow was concept only, I do not have the skills or the software to make a proper dinghy design. However, I believe there is still value in the efforts of David and Arne.
It appears that a fleet of one-design JRA sailing tenders is unlikely. That being the case my suggestion would be to withdraw the prize and the competition aspect, and just conclude with publication of a gallery of "concept sailing tenders" from which future tender-builders could draw inspiration and ideas. This is assuming that Arne and David would agree to having their efforts put forward as concept designs.
Of course, I do not know anything about the other entries and if it is felt this would be unfair to those who have drawn up designs and made serious entries, then please ignore this suggestion.
If the suggestion is thought to be useful, then I would further add that each concept design should consist of a concept drawing (or two) and be accompanied by a brief explanation from the designer. Expressions of interest in actually building any of these could, I am sure, be the subject of further discussion with the designer.
On that basis I would be happy for the scow design to be included, just to make up the numbers.
PS I have no doubt that Arne's creation of his "Halibut rig" has been a major step forward in the development of a simple dinghy junk rig. This rig may well be adaptable to almost any tender which is capable of carrying sail, and I think we will see more of it.
Apart from anything else, for that outcome alone, the competition has been of value, in my opinion.
PPS an alternative suggestion: publish two sections to your web page: (1) competition entries (2) additional proposals, concept only.