Thanks guys.
Yes, I have been thinking of glazing the inside, but that would also limit what I can do on the outside, and without outside decoration, it wouldn't look very distinct. But I am debating it. There's a few methods that I'll be poking at. I can glaze the inside and rim, as long as there is not glaze on the outside/top.
I never really thought about snakes preferring round to square, but it does make sense.
If I do get to the point of selling any, I will post here in the For sale type section. After all, THIS is the premiere ball python site. Period.(also it's the only reptile website I haven't left because I got tired of nasty attitudes and drama, because BP.net doesn't have that!)
As far as cleaning, my very first concern was scrubbing snake poo off. Once i've shown this to a few people, I do intend to test it by scrubbing and getting it dirty. I know it can easily be sanitized like any stoneware, but scrubbing even slightly porous stoneware can be a trial.