Thx for the fullrez pics, looks really cool. Quite minimal and clean to the first glance, but packed with useful features.
One thing that caught my eye is how that brake cable jumps the gap in a perfectly straight line. It would be kinda cool if the upper stop was rotated upwards to the left side of the tube instead of the bottom, and the cable could run without housing to a lower stop near the brake. But I guess maybe not a good idea to have the cable exposed across the open middle (bump it and accidental braking!), and for city use it's probably better to enclose the whole cable for cleanliness.
Also, that chain is so short, how many links did you have to discard! That really has to bring the back of the wheelbase forward. Maybe wheelbase forward of COG is more important to handling than rearward?
Looks real cool though, I bet you have a blast zipping through the city on that. Good work!