Good thinking, sir.
I have often thought that a 99, with the hinged cocking lever, would lend itself nicely to such a project. The Predator runs a similar layout, the lever itself running on some of Ivan and Dave's lovely synthetic bearings. My Pred is currently with Steve. It was 'Glided in 1990 and is still smooth, consistent and with a very healthy power output. But thought a refresh was in order.
And I wanted Steve to do it as, although I could do it, I wanted the "authenticity" to remain intact.
He also has my 77 Vantage there.
The Boingermen would love to see you at a Boinger Bash one day, as you obviously have the knowledge and passion with the springers.