Thanks for the links, some good stuff to look at there. As far as the available pedaling force with a more forward bottom bracket to seat angle and not being able to push down as hard into the pedals. I've ridden a few cruiser and chopper type bicycles with the bottom bracket even more forward then the 60-degrees set-up I drew up and find that those with a seat back rest that you can push back into while seated really helps to maintain full pedal force:
