guidothepimmp I have no idea in what key it is. I just tuned my guitar until it had a nice open tuning I like. So probably open D or C. I will see if I can get the tuning again and grab a tuner to see what each string has been tuned too. Then I just played with finger shapes until I got the sound I liked.
For the actual recording I just recorded each part twice and in sections, except for the Guitar C (C for centered =) ), which is basically a single take of the verses and chorus and then panned centered. Guitar L and Guitar R supports Guitar C, each separate recorded. Guitar a L and a R is a harmony of sorts recorded twice, Guitar b L and b R is the high octaves you hear coming in at the end just to give it a bit of build up.