Just finishedsections 1, 2, and 3 of the build process and so far everything has checked out well!
Section 1 contains the the voltage regulators and keying section. All tests were successfull. The manual is not quite clear about mounting the jumper from +8V to R24 but without it MP3 will never have the +8V.
Section 2 contains the AF amplifiers is also finished and all functional tests passed. I don’t know what the MP4 test is supposed to do, probably just some humming in the speaker.
Section 3 with the IF amplifier is finished too. Touch-tested at MP5 and MP6 and it seems ok. A more functional test with a 4MHz signal generator or a noise generator would be much better.