I'm not Andy, but...one trick I learned a while back, was to just double the guitar tracks and then move the two new ones over like a few milliseconds. One track back a few milliseconds, and one forward a few milliseconds. Nothing too drastic. It's not going to give the same exact effect as double-tracking, but it gives it that feel still. It really only works with high-gain amp tracks, for anything cleaner it's more robotic sounding. It doesn't always work, but usually it does for me, just depends on the tracks. It takes some messing with but it creates a similar effect.
Then, what I'll do is EQ the new tracks completely different than the first two, as to kind of give it the effect of using different amp settings. Again, this is just a simple cheesy way of achieving the same quality. I only do this for when bands come in for like 3 or 6 song demos and they don't have time to double-track guitars. For anything coming in for more than a day, I make them double-track. Try it out, see if it works for this project, it may work, it may not...only way to find out is to try it.
If it doesn't, I dunno what to tell you other than make sure the two guitars sound kinda fat from the eq if the duplicating and offsetting doesn't work. Good luck.
~006
