[Arran]

The legs can be replaced, I have done so before on a Canadian Marconi cabinet, in my case it was because the originals were damaged not missing. A new set could be made up by someone into wood turning or a used set could be harvested from a junk cabinet and transplanted onto yours. In fact since this lowboy cabinet was pretty popular during the late 1929, 1930 and 1931 model years you may even be able to locate a decent empty cabinet, that is unless that exact cabinet has sentimental value of some sort.
Regards
Arran