Notes for the most recent attempt.
Cut into relatively small chunks - worked very well.
Used rectangle pan 9x12
Don't use pineapple juice any more - pinapple chunks - yes - pineapple juice no.
Uses 3/8 pound of butter - too much - reduce.
Used 1/2 cup of OJ - reduce to 1/4 cup next time.
Put full layer of marshmellows - that worked - but by the time we got to the place they all had vaporized. Next time, use mini marshmellows and put on at the last minute - perhaps use a microwave at the destination to soften marshmellows.
Next time, put some cornstarch into the OJ. This stayed too soupy.
Remember that the potatoes give off liquid.