I agree, definitely a home-made cabinet around the remnants of an old piece of furniture. I heard the 630 chassis was available in kit form as late as 1949. For what it is, I think it's an interesting period piece.
This was the only 630 TV-only console made. The rare, but surprisingly not very sought-after 630TCS:
http://www.tvhistory.tv/1946-RCA-630TCS-10in.JPG