I have. Sorry, I didn't check the previous page so I didn't know there were any open issues. Then again, I don't know if I can help.
Which unofficial patch do you have installed? And on that note, does the saber appear like that in every level? The width of the saber's core as well as other measures are handled by COG commands and the level in question (12?) doesn't have a level-specific cog that would define those measures.
In this screenshot I've used Xzero's latest unofficial patch.
From left to right: Normal saber in L12, Xzero's saber in L12, normal saber in L04, Xzero's saber in L04
So I had to use cheats to get the saber in L12 because there's no cog that would automatically give it to you in that level. And since there also aren't any commands to define the specific measures, it looks quite similar to the saber you posted. Xzero's saber, however, looks proper because the saber measurements have already been defined in kyle.cog used by the mod in question. However, in level 4 the situation's different because the level's main cog overrides kyle.cog so Xzero's saber looks like a long and quite fancy toothpick.
In other words, it would require some cogging to make the sabers look proper in every level of the main JK campaign with all the patches installed.