I have already waxed lyrical about why I think the Aeronaut is so fabbo on my blog... and I've been mulling this idea over in my head for some weeks now. I think that a shorter aeronaut (and slightly slimming the other two dimensions) would be an excellent variation on a wonderful design idea.
The easiest way to do this is to simply lop off one of the end compartments, so you've got the big "middle" section (still large enough to fit a clothes bundle), and one of the end (I like to think of them as "shoe compartments") sections.
From my reckoning, this won't affect the positioning of the backstraps. However, it may affect the positioning of the "suitcase-style" handles and the shoulder strap attachments though. Surely that wouldn't be a problem for Mr Bihn-the-design-genius though?!
But for those who like the large compartment with an extra compartment, personally I think this could be a good solution for a smaller version.
Just my two cents.