Re: 11 speed on a 10 speed compat. Free hub:
Have you seen this:
Can't vouch for its accuracy and application to MTB freehubs but it does have some dimensions in there.
Also Sheldon Brown...
Some interesting points here.
I think the entry and low-to-mid levels for 'proper' bikes is really tough, a bit exploitative and relies heavy on marketing rather than performance. The preponderance of top-end bikes...