Have you discovered storybook structures around the country? They remind us of Hansel and Gretel fairy tales, and were mostly built before World War II. Storybooks would make great little homes today.

The City of Oakland (CA) built this storybook cottage in 1927, as a fire station with full garage. It may become a museum. (Oakland History Room)
These days we don’t see storybooks getting built, though some homes may incorporate gingerbread-like elements. So Tiny House Joy decided to search for building plans with more signature features.
Storybook Homes came out the winner, after issuing The Truly Tiny Collection a couple months ago. Here are their smallest tiny cottage designs for your review.

Beesborough Studio measures 148 square feet, with a 12+ foot wall diameter. This space is for study or hobby purposes, rather than full-time living. (Storybook Homes)

Mustardseed Cottage offers 540 square feet on one level, featuring a great room, sleeping area for two, U-shaped kitchen and full bath. (Storybook Homes)
I think that Story Book homes has good out of business as your links are broken and they have made a statement that they are no longer taking orders.
Thank you for update