I will probably close this thread at the weekend. Kirby Kite looks like the narrow winner, so looking for best three views available. I will chat with Roger off line to see what might come second.
I really don't want to cut across the bows of any other potential manufacturer who is designing similar. Waste of effort for all concerned.
I will make the whole design process a new thread. Not only will that hopefully be informative as to how to design a model in 3D CAD, but I will also be instructive to get feedback on the design as it progresses. And helps keep me motivated.
Nothing is cast in stone till its finished.