You shouldn't need to port those files anyway. Just pull the .mdl and .mdx for the longsaber from TSL, make a bunch of copies of both, rename as needed, and hex edit the .mdl files to point at the proper textures.
[EDIT:I didn't have anything else productive to do anyway ;)
THESE (
http://www.frontiernet.net/~gt_dragoon/TSL_longsaber_models.zip) should do the trick. I based them on ChAiNz's pack so the names should already be correct if you left them alone. I also included models for silver and viridian (I think bronze and orange are the same?) and kept them separate from the rest. You'll just need to do some icon and crystal work if you want to include them :).
If any of them give you problems, just let me know.]