Troutfisher, I bought a Slim Semi from him a few months ago and I had him include a Kydex neck sheath too. I was really impressed with it. Well fitted, very even seams, just what I wanted. I haven't seen any issues with it dulling due to the Kydex.

I have gone back to the leather sheath recently though. I started noticing where the sheath was starting to scratch the smooth Westy scales and I just couldn't stand it anymore.

My next Ingram will be jigged and beaded (probably G10) with a Kydex sheath--I figure with the jigged scales, I won't really care about the minor scratches the Kydex may impart.