Oh, hey. I'll go ahead and out myself for faulty thinking, because it might help others.
I woke up this morning with a realization that apparently my mind had been working on over night. When using an FDM printer, putting objects side by side doesn't significantly change the time to print compared to printing them one at a time.
But NOT true of RESIN printers. If two items are on the same platform, the time to print is roughly the same as printing ONE object. (the tallest object)
Translation : I put the TWO large objects on the platform to print at the same time, and it prints just as fast as printing the tallest one object. Potentially, I could do two print jobs in one day and get all three print jobs done. There are other concerns such as distance between objects on the bed, supports, and weight. But a person could put the top half, the bottom half, AND the flaps on the same bed, if you can fit them, and print all pieces at the same time. And it would still only take as long as One Piece. (awesome anime)