I really like that you have used a completely separate caliper for the hand-brake/e-brake. Good to have just in case the hydraulics get unhappy.
It's an interesting way to reduce weight, including unsprung and rotating weight. Hopefully the torque applied won't turn out to be a problem.
For economy, you should note that disk brakes will drag on the rotor slightly. Drum brakes will not. I don't know that it will make a noticeable difference, but it might have just the tiniest bit less rolling resistance if you had used a drum back there instead.
If you're going to be using your brakes heavily, you will want to at least think about cooling that single rear brake. A bit of ducting would likely be enough, but you're still working in a pretty confined space back there. Seems pretty neat, though!!
-soD
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