Hearty request for SIDology Episode 2...
and they thought Through The Fire and Flames was hard! 
Well, any song clocking in at almost 13 minutes with such intense parts as Trinity will be hell to play (cool hell, though), but I don't know if it'll beat Through the Fire and Flames in difficulty. Large parts would be relatively easy, and difficulty would depend a lot on whether you chose to play the guitar or the SID in certain parts.
Having a GH version of Trinity would still be awesome.
I want a version of GH that allows for playing home-made songs like this, and the corresponding console. I only have access to the 360 version :'(