Kevin of Mad Dog Knives has done some great work on Sebenzas in the past, nothing artisitic, bit rather functional- smooting the handle edges, opening up the radius on the opener cut out, etc. Like Mayo, don't know (in fact doubt) that he would do anymore.
There is a gentlemen named Matt Cuchiarra (sp?), used to post here is Pontiaker years ago. Did awesome knife cutomization jobs, especially Ti handled knives. He went on to become a knifemaker in his own right.