Apparently, this bike uses a Cannondale BB30 with a Tange BSA adapter. I've used this replacement bottom bracket in the past too.
I'm not sure how the clearances work, and my understanding is that this bottom bracket is kind of unique to Cannondale bikes.
I wonder if this bike is doing something similar.
Did you end up converting your Cannondale Habit? I have one too and am considering a BBS02. I am concerned it may hang down too far since it probably can’t be rotated due the curvature of the frame.
The biggest issue I see with that frame is the horizontal section of the downtube close to the BB. Seems like that will prevent the motor from rotating up much to a more horizontal position for mounting.