Actually, reading these posts again, I think Ray answered the original query in the second post - if you want it tuned in fifths, you either could tune it GDAE (as per what we call an octave mandola in the UK), or CGDA (as per a mandocello’s lower C tuning). I also use a re-entrant tuning on a cittern - DADAE, but that’s just to lesson the overall tension on the instrument.