Ok, looking at when RogerRamjet uploaded Part 9, which was 5 days ago, it appears he's still working on this.
Speaking of the 1930's/1940's cliffhanger serials, anyone want to take the endeavour of "preserving" the ones which inspired Indiana Jones? Including the film The Secret of the Incas? Alot of the serials might/might not be in the public domain.