I could not find anything about the SoulForge in-game, in the server folder, or even in an online search in ServUO.
So here is a release of SoulForges I had around my other folders.
Mini SoulForge /with deed
Royal SoulForge /with roof no deed
Regular SoulForge /with deed
I hope someone can make good use of these and possibly get them in the next release of ServUO
If there is in fact a SoulForge for ServUO already released that I am not aware of, please let me know.