Giant Connector Plug
A mil standard size 40 shell with a 40-9 insert will give you 1 #8, 22 #12, and 26 #16 contacts, which would be a total of 47. Go to Digikey.com, look at product lines, and under circular connectors select shell size-insert 40-9. As of a few minutes ago, that will give you 84 choices.

The next size down with the necessary power contacts is the 36-18 insert, with 1 #4, 2 #8, 14 #12, and 14 #16, but this is only a total of 31.