Hmmm, to cut a long story short; 1, the IIIc has an Orion 6 on it and film in it. The others all have body caps on them, 2, because I wondered if it would work on the IIIc and will soon put a 30's f/2 FED on for the same reason and to finish the film up, 3, one at a time is good enough for me but I sometimes carry a two or three lens and body outfit. Two lens outfits as 90 and 40mm (CL obviously); 35 and 90 (everything else) and three lens outfits as 35, 50 and 90mm. And from time to time 28 and 90mm. That applies to all the CRF's, Contax, Kiev, FED, Zorki, Werra and so one.
Having typed that I wish I had a Minolta CLE but, well, you know the rest...
Regards, David