In a small/packed, regular minerals universe, BB-gorillas, organic, IS-10, s.computers, and armageddons by '60 isn't that hard. This is also with AI enemies. I never could stand to sit here and play out, properly, a game with no enemy. Always got sloppy at about 2420. The '60 mark didn't include producing 100 of them, nor with jammers. I did, however, always have regular defensive fleets of hundreds of yakorma DDs and colloidal CCs, and orbitals with Driver-7 or -10, as is required to keep from losing all those last planets I had to take from the PP AIs.

Even if I played out a testbed, though, I don't think I could get anything like that by the '40s. I'm usually struggling to get EITHER bazooka CCs or colloidal DDs by '30-35, depending on setbacks and luck.