I am sorry I have no comment on the forte, I have never heard them. I'd be interested in what you think... I just about got a set fortes instead of the Cornwall's I recently purchased. Someone beat me to the fortes, but I think I am ok with that now.
I put a ti diaphragm in my KG 4.5 horn and I really liked that too. Good luck with your cosmetic project, will you be sanding and re-staining? What kind of final finish? I am interested in your process, as I need to do the same to mine.