Thanks There are some good movie clips on YouTube that demonstrate lume application. After application, I used the heat from a lamp to crack the lume slightly, dusting the dial with a matt varnish spray after.
No problems fitting. A nice snug fit. Generally, if you do encounter problems fitting the retaining ring it's no biggie to sand down the outer diameter of the crystal slightly.
You can pick up rep 702 crown and tube from Athaya, a member here and also other forums. This can installed by countersinking and re-taping the case as described previously. Good luck with your build.