I agree with what Marcos said... You're never going to make it sound like Jimi... One, because he was so high HE probably doesn't even know what he was doing... Two, he was Jimi Hendrix...
My advice to everyone out there trying to do the Star Spangled Banner is to make it your own... I played it before a few sporting events in high school... and basically all I did was learned it note for note transcribed from its original form... Then did my own distorted, wah'd, overdriven, and shredded version of it... The point that Jimi was trying to make was that everything is left to artistic interpretation. Make it your own.