What is a bitty house? You mention it in your stories but never describe it. My imagination either falls onto a sideways box or a doll house.
*Bitty houses are where bittybones like to live, and there are as many types of bitty house as there are bittybones (and maybe more!). The lamia bittybones like to have a nest which can be as simple as a pile of blankets for a Corny or an elaborate throne of pillows and accessories for a Mamba. Regular bittybones generally live in either homemade or manufactured dollhouse style homes though a sideways box with a place to sleep works just as well.
*The bitty houses described in the Bittybones fanfic from my blog are custom built. There are multiple compartment “rooms” that resemble an open dollhouse with dividers to block people from seeing inside for privacy. Bitties can travel to different levels using stairs and ladders.
*It would look something like this (but imagine the hamster as a bitty):