The SB 13, 14.5, and 16 are all the same basic machine. Same capabilities, just at a different size. The 14.5 uses some 13 parts, some 16 parts, and a few that are unique. That is the only downer. Since the 14.5 wasn't as popular, the unique parts, if needed, can be difficult to locate. For the most part, you shouldn't need to be looking for such parts if you get a good condition complete machine. The only consumable that is unique is the ways wipers. Steve Wells doesn't sell a 14.5 kit. He did offer me a 16 kit (everything else is the same) and a sheet of felt to whittle up my own.
As far as being a lathe. It's a really stout piece. I believe my weighed in at 2100#. Lots of 'merican cast iron.