Casual follower of his work, here...
I have seen/heard his performances using a Strat, a PRS, and classical. It sounds like no one else. He definitely gets those fingernails in there for all picking.
If I was to going to cop Oldfield tones (and I am not going to, but *if*)...I would definitely use moderate-to-heavy compression, very little-if-any ambience or modulation.
Probably go for a very good tracking harmonizer effect for those 8ve+ harmonies or even 100%mix high pitched lines...his very quick left hand vibrato is more classical in nature (rather than typical blues-based perpendicular movement to the string).