I think you should go with it! You've got the idea, and the writing flows naturally from you, of course the hardest part is actually doing it, but I think you can.
Funny thing about Ishmael--I was thinking about that book today, and how you'd recommended it to me. I made plans to go pick it up tomorrow, and now I'm definitely going to.
If you ever have any more writing, I'd be more than willing to comment/critique/edit. I'm an English major for a reason!