Ah Genghis, ever the engineer!
Let me look at it another way...
So long as it uses less than 5 IG/hour, can run on cheaper stuff than Avgas, has an endurance of at least 3.5 hours and can lift two 89kg people without restriction - I'd be happy as an owner or a student pilot. I don't necessarily mind continuing to train on old aeroplanes but I wonder why some places do so at 8USG/hour
The engineer in me would like all the fancy aeronautics and systems stuff as well though.
In terms of handling/space/fuel economy...something like a Beagle Pup 100. But with no payload/fuel restrictions and more performance. It's a real nosewheel Chipmunk.