Good points throughout, Matt.you are only reaching people who are here,
There don't seem to be that many Leaf builds on here. It seems that Tesla is the majority focus but they may just be the most "vocal". You could also ask this same question on mynissanleaf.com since there seems to be some activity over there as well.
The other thing hmincr, you are essentially asking someone to design the coupler and then offering to do the machining. The design work seems to be the more difficult step at this point, to my admittedly myopic view.
Bill