I never made it since i prefer the harder coarser polenta, but i've eaten it plenty of times, and watched it made (same as regular polenta but with a little more water)
By the way, my parents grew up in the hills around lucca, where the staple food for poor people was chestnuts. They made polenta from chestnut flour (as well as many other dishes besides the well-known castagnaccio - a kind of pancake called necci, (pronounced NECH-chee) cooked between two irons and eaten with ricotta (sounds great, but it was very disappointing when i tasted it - i guess my parents grew up hungry and that seemed like heaven), and a kind of polenta thing made with chestnut flour boiled with wine (now that one is outright gross).
A funny story that came to mind when you mentioned the highlander's hardened porridge is one that my parents used to tell about very poor families they knew. They would buy a baccala' (salt cod) and hang it over the table. They'd take their slabs of coarse corn polenta and slap it against the cod to get a little flavor. At the end of the month, it was soaked and cooked for a super luxury treat (eating actual fish). Poor peasant food can be good, but sometimes we idealize and romanticize it out of proportion!