Not yet finished mounting the motor. I've worked out in my head a method to securely mount the front end of the motor to the downtube. This will utilize a modified in-frame bracket that I've ordered from Italy along with the chain guard. I won't be satisfied until the motor is completely secured tightly at all 3 through-hole attachment points, so I might as well just do it right up front. Basically, an ATV accessory mount will be attached to the downtube, and the modified in-frame brackets will bolt to that. That will mean that the short mounts attaching the motor to the bottom bracket are twice reinforced. I went out of my way to cleanly secure my BBSHD builds, and will strive for the same here.
I've also ordered a pair of Magura MT5e brakes that I intend to splice into the ebrake wires. And I've ordered an Ahearne Cycles Uprising Riser Bar which looks like an improvement over the Surly Sunrise, as the crossbar has been upsized for mounting of accessories. Also, the clamp diameter is 31.8mm, so I won't need shims or a BMX stem.
And since I will be running Schwalbe Marathon Plus MTB tires, the most heavy-duty and puncture-resistant tires available, I am debating lightening the rolling mass and rolling resistance with TPU inner tubes. I'm not interested with messing about with tubeless. TPU tubes are expensive, but I don't anticipate needing to replace them frequently. I think thick tires, and ultralight TPU tubes could be an excellent combo for ebikes.