For the Rosetta, I started with the Fool, and though I didn't do all the trumps first and then the suits in order, I stayed pretty systematic. I did the Fool through the Lovers (for letter Zain meaning Sword), then the entire Swords suit in order. Then more trumps, though staying in their proper order, diverting after Fortune (Jupiter as ruler of a fire sign) to do the Wands, after Hanged Man (element Water) to the Cups, and I think just before the Universe (earth and saturn) I did all of the Disks in order, saving the Universe for last.
The deck I'm working on now I again started with the Fool, except this time I'm planning on doing all of the Trumps in order, then all of the Aces, etc and working through the Tree of life then the courts. or vice versa.
I guess I like to have a system with room with room for synchronicity. The cool thing so far with both decks is that even working rather in some sort of order, the cards I was working on at any given time always seemed to line up with an appropriate astrological aspect with a similar vibration at the time - and it is still happening! For example the Rosetta Fool was started when Mercury was stationed at the Aries point - the beginning of the astrological zodiac, and the Empress was made with Venus in one of her home signs, etc. The coincidences went on from there for almost every card. Still seems to keep happening with my new deck in progress too. I really should write these down as they occur, they are so interesting!
Thanks for the question, am loving reading about how others have approached this!