Shit Ola, I've been listening to the wrong version. I listened to the Diablo II original which had different instrumentation to this... so I wondered the whole time 'why did he change it?'
I just booted up the Diablo I version and now I can see the full out similarity. You did an ace job man! Think it'd be too much of a stretch to cover the Diablo II version? I prefer the arrangement on that one myself.
Link?! Don't remember there was a difference between them.