I have this wonderful DSN PAM 25A in Titanium. I still have not found the right strap for it! I tried black rubber, Tan colored, vintage black leather and other straps but it is still not a perfect match.
What do you wear on your titanium Panerai's?
Bleach bezel insert, relume dial and hands. Soften case edges, reshape crown guards.
It is not that easy to do it all yourself. But it all has been covered quite a lot and a good search should take you to some good tutorials.
I always shave the outside of the crystal till it fits. I don't like the idea of making the retaining ring thinner. I have never noticed any difference with the overall look and effect of the crystal. Just shave a very small part of 1.5mm (the thickness of the retaining ring) and take only a tenth of a mm off.