Anklpocket,
Please bear with me - I'm a cranky, cynical bastid, but I just have to tell you that the search feature is a very useful tool here on BladeForums, and, believe it or not, we've talked about custom bowies here before.
Look
here for starters.
Then, I'd encourage you to check out a few dealer sites - especially those that show knives by type.
See some bowies from KnifeArt.com
here
See some bowies from Nordic Knives
here
See some bowies from BladeGallery.com
here
Once you've browsed through everything that's already currently available on the subject, you'll probably come up with a few makers you'd like to learn more about. At that point, you can do another search, this time for threads that mention those makers' names. My guess is you'll find some good information here.
At some point you'll probably come up with some more specific questions, which might be worth asking here.
Please forgive what may appear to be a rather caustic attitude - I'm really just trying to be helpful in a straighforward way...