Re: 4 stroke cruiser with SBP shift kit
I disagree on the Stage III being "very" reliable in general, even with locked engager. I have a grenaded one in my toolbox and I've read more than a few horror stories on the forums. Some of them might somehow last thousands of miles with varying amounts of work, but some of them just don't live long and might just grenade. The straight-cut gearing system using cheaply cast gears doesn't really lend itself to overall success in it's application.
Anyway, I like OP's build - 4-stroke shifters are pleasant cruisers day to day, from my experience. There's lots of room to improve on that rig, too!