Weekend work complete. New seals, and dust cap installed in the forks. For reference a 15/16th socket makes a perfect seal installer. I also had to lightly file the top lip of the damper rod to get it to slide through the plastic bushing. I think torquing the top nut so high has a tendency to mushroom it a bit.
As for touring the top nun, it's this tight

I went with a slightly heavier oil. I think the recommended is 7.5, and I went with 10. Fill to 175cc.

Started to mock up the new brake, and controls. Kind of okay with the way the reservoir sits.


Check out Wiring Diagrams for Derbi, Aprilia and More! For some guidance on how to rewire the Domino controller. I picked the controls up from Treats, it's the Domino Buttons 0038AB. Feels like good quality, and as pointed out by ToraTora, it has a dimple on the right side to snugly fit next to the Domino throttle.
Domino Buttons 0038AB

To make it work for the Derbi I connected the black wire with the Orange wire. So Orange activates when the switch is in the "Run" position. Then you need to swap out the end connector on the Black/White wire. I used some of the left over harness from the original part. I also needed to lengthen the harness from the brake switch, and again used some of the leftover wire.