Lessee here...
The 603's were x/y'ed about 2.5 feet in front of the guitar and centered on about the 12th fret. Guitar was angled away from the mics about 30 degrees cause that's where it sounded the best in the cans. Ended up being a bit too tinny in the monitors.
The guitar is a beat up old Appluase roundback with a deep bowl. The deep bowl makes all the difference. The poor thing is on its last legs, I'm afraid- the bracing is beginning to buckle just under the soundhole. If it sounds good then you're hearing the love.

Its been my main guitar for 13 years.
I just went in through the pres on my Alesis Studio 24, with an RNC inserted with enough compression to catch the peaks of my percussive playing. I know you're not "supposed" to compress on the way in, but I hit the guitar hard when I'm into it- and being into it is the key to a good take for me. Besides, the RNC sounds much better than any of the software compressors that I have.
Part of the neat sound you are hearing is that there is a doubled guitar mixed in much lower- C1's x/y'd in about the same postition and run fairly hot through an Art Dual MP. Unfortunately, the C1's were a bit too boomy there and were a tad too compressed on the way in. I brought them up just enough to fill in the low end and got that delightful lightly doubled sound. It was just my scratch track, really, to arrange the song, but I'm glad I kept it just in case.
I don't think I added any effects or EQ except for a tiny hint of the same reverb that's on the vocals- an attempt to bring them into the same room together. The whole deal was then brought up to -.2dB peaks with t-racks just becuase I like the way its gain staging thickens the sound. I didn't use any of its compression, limiting or EQ.
That should give you most of the variables without going into the weirdness of my room. I hope that wasn't too much information!
Duh! Right! I almost forgot- the whole deal is converted to digital though
a Tascam US-428 and run into Cubase 5.1 on my laptop. I've heard some people say the 428 has a dark color so that may be affecting the sound, too.
Chris