I've got itar's 8" FS tower pieces, and they're pretty well done, but I'd buy an even better "official" HA 8" FS round tower without question. I might never build a tower with them, but for round rooms and curved corridors, I'm just glad that I've got the CMP set in the meantime.

While we're going in circles, if you could add an extra 5" and a 7" diameter round block to one of the molds, that would be great for "spacers" between inner and outer rings, or the rare odd diameter curved wall if somebody actually wanted to take the time to cast enough of them.