Hi Phil, Merry Christmas to you too (:-)
I have recently sent in an article on scribing, Rowan will publish it when he gets back. In the process of re-scribing my B-26 Marauder for it, using most of the methods suggested, I discovered the easiest way to scribe ever. Actually part of my method is similar to Scotts idea but there are all the compound curves to take into account. Without re-writing the article it would be difficult to explain. Suffice to say it takes all the pain out of re-scribing. well it does for me anyway.
For scribing the lines I did have many different tools, but about the only one I use now is an Olfa-P cutter. You can get them in craft shops.
Rowan should be back soon
Mal