Hi
as i am very interested in semantics and accessibility, i had a look at beez3 and its html overrides in joomla3.
The html files are quite similar to those of beez5, except the param > if hltml5 or not.
The semantic strukture is more logical as in the core, so this could be a good starting point of optimizing the jooml html output.
The specific bootstrap classes of the core views are not implemented there, but this could be added,
What are you thinking about this idea?