R2AK is on the bucket list but not as a solo.
I don't know how Donald got Nigel to design the amas. I do know that Donald and Russell became good friends and when Donald passed away, Russell and Paul Bieker bought back the tri, which tells ya something about the boat, and as Russell says Paul sailed the shit out of her without any issues while Russell worried about her.
When I got her, she needed some brightwork, new outboard, tramps and new sails. Russell called Randy Smyth and they cooked up a new main and jib for her. I'm not sure what the best pedal system will be and how it would be installed.
I have the molds for her as well but it would require some additional engineering/Russell magic to build another Humdinger. The build quality of this tri is stunning and an example of what an amazing craftsman Russell is. It is a floating piece of art and should be in a museum.