I know back in the day there were a number of manufacturers (Christian Fletcher, Sonny Suttles, I believe a few others) who did custom hilt fittings for Gus Trim blades. Does anyone know anyone is still doing that kind of work, or have they all moved on to other projects?

I am sure Sonny Suttles would do that again. I know Wes Beem of Lonely Wolf Forge would do a good job. I would also contact Tom Kinder, although his wait time is huge.

If it's a falchion, I know James Elmslie of Scotland has been curious about doing something exactly like this, giving a traditional fitting job to one of Gus' falchions. It would be expensive to send one all the way there, but worth it.