The non folding Twenty I have had a really nice retro 'twenty' logo on it - albeit in a bit of a messy state. I intend to refurb the frame at some point so did a tracing of it which I duly drew up in Illustrator so I can make vinyl repros when I get around to it. I don't have the art here to show right now but would happily send you it - Vector art is the only real way to go with vinyl lettering.
Also - you can get a old-skool vector Raleigh logo if you search
http://www.brandsoftheworld.com that you can open in Ilustrator/Corel or whatever and muck about with.
I actually have a few sets of NOS decals too but they are late seventies ones in yuk colours which would probably look a bit tacky for the roady style bike you are buiding.
Huw