The simplest (not least expensive) method of building engines with scarce pistons is to bore and sleeve the cylinders and reuse the same pistons, assuming they're not severely damaged. As with any kind of 75 year old equipment, refurbishing it is not for cheapskates, or someone who wants to find the "easy button". "Buy once- - - -cry once" applies in these situations, at least most of the time.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!