Eh, yes, but, no?

The Ti forgings for the SR-71 required building the world's most powerful presses. Two were made. Only one still kind of exists, IIRC.

If you're trying to do that kind of thing, yes, you need boatloads (literally) of Fiat. However, you're not building a pressure vessel. You are building a floating structure. You can do most of the work with formed sheet metal. Welding Ti is totally achievable with fairly standard practices, just with more shielding with either trailing cups and backing or various other methods used in aerospace. It's hard, but 100% doable, if you can get the material. China is pumping out millions of cheap Ti goods formed to a very precise degree. (I have a Ti flask that is comically light.) The tech is there, and achievable.