About KT recognizing your files from override, well, KT won't open up your override folder basitems.2da, but what is does is it recognizes that there are new rows in it, so that you can change your weapons to the new row without a GFF editor.
You'll need to open the 2DA editor and load the one from your override.
Ah, yes. I forgot about that. Go over to the powereditem column (in Baseitems.2da), and change it from 0 to 1. Also change the powerupsnd to cb_ls_powerup, powerdownsnd to cb_ls_powerdown, and poweredsnd to cb_ls_humgood.
Save, and your lightsaber shall animate (hopefully).