Reese Weiland - Reese is a very well known and acknowledged knifemaker himself. And luckily, he does the knife modification and customization works too. He did outstanding job with my Benchmade AFCK.
http://www.chaxknives.com/ - Knife modificaitons. I haven't worked with them but they have positive feedback on bladeforums.
Custom Knives by Daniel Koster and customization works for your kukris as well :)
Sunrise Custom Knives - Knife modificaitons. No personal experience, but recommended on bladeforums.
Tom Stratton - Knife modificaitons at fair prices. No personal experience, but recommended on bladeforums.
On/Scene Tactical - Custom Sheathing Systems. Very popular on bladeforums and with knife enthusiasts in general.
Last revised - 10/04/05