Simon,
Your best bet is to contact Frank Catt at
Wealdenengineer@aol.com.
He made a beautiful job of deepening my nostril panel, including painting it. What's more he got it right first time! [img]/ubbthreads/images/graemlins/grin.gif[/img]
If you still want to do it all yourself, I'm sure he'll give you lots of info on how to do it.