Lovem. Cool history, enjoy the conjecture. I would get them tested, hang on to them (I like the aquarium idea!), then get yourself a ... POTATO GUN! Launch those suckers! Lotsa fun!
Man, that brings back memories. I built half a dozen or so of those back in the 1990's and early 2000's. Y2K pepper stuff. Z
Dyslexic phone thumb typing + Samsung AI (artificial ignorance) spelling autocorrect . . . . . ., but, you make a good point . . . . .
We were launching taters & tennis balls in the late 60’s / early 70’s. Even taping beer cans together (both ends cut off) if we couldn’t get pvc.