Actually that sounds kind of cool. Don't play jazz myself, but it's really a feely kind of music and can be tough, you would have to be real good at that first to pull it off I think.
while metal can be easy to play, you'd have to give it it's due and come correct with it.
One of my fav albums Badmotorfinger Soungarden was actually kind of a mix of sabbath guitar and punk beats.
but, I can see it being really cool done right. Please though get a good singer and not some off key screaming ass monkey with bad hygene that needs a shave.
I'm hearing too many good metal bands these day that I just can't listen too because of the lack of decent vocals.
Screaming every word isn't metal, it's just ghey and talentless.