There are of course also long stroke 570 cranks about.
I'd recommend putting a wrap of protective screening around the front of that oil filter element.It's right behind the front wheel, and stones could kick up and puncture the filter element.I cut a square section out of an old screen door that had a heavier mesh in front of the bug screen, and then used zip-ties to wrap it tight to the filter element on mine. Also, I offset my filter housing toward the primary side, so it wouldn't be directly behind the wheel.
Thanks--on planning for the fireball, I was going to re-mount it vertically on the frame down tube to keep it well clear of the road. Any disadvantages in that?
As far as I can envision it, that would be fine. I don't see problems with vertical mounting unless it's upside down, in which case the filter element would need to be equipped with an anti-drainback valve to prevent filter drainback.