Details, details.
Today's discovery was that a Dunlop Q3 160/60-17 DOT tire is wider than a Bridgestone 165/630-17 slick, and the Deltabox swingarm (this bike) is narrower towards the front than the old fabricated-extrusion swingarm (race bike). Once guided into place, the tire clears the chain and the swingarm by millimeters which is OK, but it hits the brake torque arm, and forget about the chain guard - no chance. Getting the tire into place was a chore ... but not helping matters is that with new (different) sprocket sizes, the chain is just barely long enough.
I fixed the brake torque-arm situation for the moment by re-mounting it differently, on the outside of the tabs instead of centered on the tabs. I don't use the rear brake when riding, and the torque arm is under compression in this application, so the fact that the bolts are now in single-shear instead of double-shear shouldn't be an issue in the real world.
And with this ... the bike was on its wheels and capable of moving around for the first time in months. It felt like it was sitting very high. Quick front sag measurement gave only 22mm. Although the combined length of the fork springs and spacers was made the same as stock, these springs have a higher initial spring rate, so this wasn't really surprising. I hoisted the bike back off the ground and took 10mm off the length of the preload spacers, which should put front rider-aboard sag where I want it. I know the rear shock is longer than stock (even with the ride height set to the lowest setting) but I'll hold off adjusting that until I can have a test ride.
I need a new longer chain; after that it should be ready to run.