The one thing about demos is you really have to consider the player. Fortunately, I find that most Guilds don't really limit themselves to having to be played a certain way to sound good. For example, I don't have fingernails on my right hand, but still can get an adequate fingerstyle tone on almost any Guild.
I'll throw something out in left field here as well. If you ever get a chance to play any maple Guilds, don't pass it up, they're consistently good. I think the F-55 is the only one they currently make and the 12 string version of it (the F-512).
Here's Trevor Menear's demo for Guild. This demo is spot on the money, and I'll prove it with my own demo below
Here is my demo with ,y '76 F-50 (same guitar, they renamed it at some point). It had some brighter strings than I normally run, I'll do it again when I restring it with DR Veritas but no post processing.
F50-Demo
Sounds pretty close right? I mean I'm using a pick and all so it's brighter.