The big mosaic starts with 1932. A complete Okeh, Columbia etc. set would be 4 CD's. If combined with the pre 1932 Universal material ( 3 CD's) that would give a almost complete 1925-1931. There would be a few loose ends left from Blue disc Gennett etc.
Off course the Universal material is all ready in a set but there have been 2 discoveries since.
Columbia late 40's early fifties would be most welcome.
For me the 1956-1962 Columbia period should be done in 4 boxed sets with each 6 LP's as the basis and supplemented with all the extra material.