Yes i knew about Ms. Lamarr, also about the Coral Castle guy.
He was not the only man to build a castle in Florida, tho Carl Clough never got the attention that Leedskalnin did and i think he liked it that way. (Why is a story for another time.) Having trouble finding any thing on him with various search engines--tho found some with same name born later, maybe relatives?
When he moved to Ruskin, Fl sometime probably in late 30's or early 40's, he built a couple of houses and rented them at reasonable prices to poor people. He apparently painted and also did billboard advertisements to earn $$. Our house that was burned down was originally his, he moved out because he built himself a castle off in the mangroves at end of the dirt road, he actually dug a moat connecting the river to an inlet so his property became an island and Dad helped him various projects including putting in a winch to operate a drawbridge over his moat. (Which is why he was selling the house to Dad at reasonable price.) Instead of Coral he used a mix of ground up shells and concrete (he called 'shellcrete') to build his 'dream' home, castle style.