In that picture I was running a small brushed motor that was able to deliver the maximum allowable of this EBRR racing class which is 1000 watts input and 750 watts output. 

The power in the class is restricted.  (you can't just use bigger and bigger motors or you get bumped up to the moped or motorcycle classes)

As an "ebike" that would be mostly street legal it needs to stay under 750 watts.

In the photo above I was using a Sturmey Archer 8 Speed hub, but I broke the axle just by the motor torque alone... so I've abandoned that.

This winter I'm working on an AC Induction concept motor that will allow a wider powerband at 1000 watts input so as to no longer need multispeed gearing.  The predicted speeds will be around 40 - 45 mph for a top speed...  but for the go kart tracks they will be racing on that's enough...  most of the time you would be in a corner anyway.  (this type of racing is about "rider skill" rather than raw power)

My earlier project bike has been to 60 mph downhill (about 45-50 mph on the flat depending on the motor) and handles flawlessly while doing that.  It uses a six speed derailler.

...this bike would be illegal in the EBRR class because it does not have operable pedals. (it's classified as a moped in my state)

Safe
I like the way you have your batteries and motor location on the first picture(#1). It allows for a low CG; an important factor on handling.
Very clean, streamlined bike for EBRR.