I'd like to donate my TFU Lightsaber pike for this project. It's for TSL and only have 4 colors, but should be easy to convert to K1 and add more colors.
Looks like saber blade textures or *.txi are messed up.
Try to search your Override folder (both in main game folder and in Workshop folder) for w_lsabre*.tga and w_lsabre*.txi and remove them.
I've got permission from Ӄhrizby to release fixed Nihilus I'm currently working on. I've already fixed sound issues with his model, now trying to fix clipping.
Release date: when it's done.
There is one issue with *.uti replacement - if you already have these items in your inventory, the fix won't work. So swapping the actual icon files is the preferable way here.