I confess to have never taken the crate off an older model but I'd be surprised if it was any different than the 4K. On that, there are only 2 screws holding the top plate to the crate (once you've removed all the other stuff the CLA thread mentions). One is plainly visible and the other is hidden under the VF/RF mechanism, which has to be removed.
Zorki: 1e (x2), 2C, 3M, 4, 4K, 5, 6
FED: NKVD, 1g, 2e, 3a, 3b, 4L (x2), 5B, 5C
Kiev 4, 4A
Yashica Minister III
Zenith C, Zenit C, Zenit E
Minolta XG M, Z1
"The way to see by faith is to shut the eye of reason."- Benjamin Franklin