Re: How to be uke/ukemi extensive
Two names that pop into my head for something like this:
Don Ellingsworth, one of John Messores' students, has awesome ukemi and shares it in seminars. And I think he charges a good bottle of whiskey or scotch. Great exercises, good basics and lots of things you can take back to class.
Also, Dan Messisco spends significant time on ukemi and uke waza . Its not necessarily his focus, but man it changes the way to do aikido.