Yep, Bodork, if you are going to use the Helle sheath, you certainly have to slim tha handle down enough to fit.
I was pretty pleased with the bigger handle and at first I was worried that I wouldn't like it as well after I slimmed it down. However, to my delight, I discovered that it feels really good in my hand! For me, slimming the handle down turned into a positive thing...
If you would post a build-a-long on a sheath...
I might would try a larger handle on a future knife. But I've no idea where to start on the sheath!