The ME magazine goes through periods where they get confused with their numbering
Rule of thumb is they used to like a 12 part build series so it goes for a year and yes they normally span three volumes
it would be too easy to start a series on a new volume so when you tried to buy the second hand mags you only had two volumes worth to find.
Normally with a Stan Bray series at least one part is missed out to encourage you to buy the drawings and castings
Looking forward to seeing the build
Jo