there is nothing special in my guitar chain. no compression, nothing. two tracks hard panned. impulse is... as usual... s_preshigh. I just fiddled around for a couple of minutes till it sounded good. that's it. and that's what you should do. play around!
for drums: I started with the "metall" preset made by thordendal. went from there, tweaked a bit, added slate samples to the kick and snare.
I did this test in 20 minutes so there is really no further tweaking. I did a quick, unprofessional master after exporting it.
did an update:
http://dl.dropbox.com/u/2932654/amptestexport1.wav
(new versions, some tweaks on the amp, new master... some more riffs
)