The only parts that were cast on the website are the silver pearl and the silver chick. Wax work and delft clay. The rest is all hand shaped using anything from a belt grinder to files and sandpaper, rotary tool, edm stones, etc... Some parts are held together with hidden (or not) screws or soldered or welded as you said.
Lot of work and I would love to be able to cast some of them in bronze or have them cast in stainless steel but for now I have a bunch of limitations, mostly space, money and of course time to learn all the intricacies of the casting process. I still have enameling and about half a dozen other techniques on my "to learn" list.
PS: I also went to your website and you do amazing work, very inspiring.