Absolutely agree, re the L42. it was simply that you suggested that L39s were manufactured using Mk2 bodies. In 10 years time when someone reads this thread, they'll say, "told you so, the L39s were built only with Mk2 bodies' - 30three said so"
It is important to correct internet errors before they become fully enshrined as facts.
It is like the Ishapore 2A & 2A1's that the internet insists were built with 'superior steel' when the facts as provided by the proof-master at Ishapore explain that they were in fact built with the same steel as specified for the No1 Mk3.
He released that information in 1979, but the stories continue to circulate and owners are convinced their 2A is built from 'better' steel than the No1 Mk3.