I think I have this figured out:
I glue as many patterns as will fit on the flooring sample.
Roughly cut them using a coarse blade designed for scrolling in thick wood.
Tape the two layers together and cut the outside of the cross with a Pegas #3 MGT blade, taping as I go because if there are no pin nails, they will move.
Find and remove any pin nails that I haven't hit already.
Once the flooring is separated from the backing, I pop the tongue and groove joints apart, add glue and clap them together.
At this point, I don't need the back piece, but I want to experiment with painting them, so I tape, drill, and cut like I would for any stack cut.