There are a few elements in the story that I wish there had been more focus on. It started out as being almost a spoof of trash novels and action movies, but it ended up with a few ideas within it that I could see expanding on. I don't know now that I would want to sit and write an actual sequel, but I have ideas (and have already begun working on) another project that focuses more on specifics, and turns the original on its head in terms of style and focus.
I don't want to give away the farm, but I am thinking of revealing tidbits here and there to anyone who might be interested. It will probably be awhile until anything becomes concrete, but if you liked Guts, it shouldn't be too difficult to jump into the new thing.