William R. Robertson furnished Twin Manors with historically accurate, 1:12 scale period furniture, accessories, and textiles produced by over 100 craftspeople, including some of his miniature artist friends and even his mother! At less than a foot tall, the master bedroom contains every eighteenth-century luxury (or at least what they considered luxury) imaginable: an embroidered bed canopy and spread, a brass bed warmer, and hand-worked rugs. All the textiles are either original designs by contemporary American artists inspired by historical pieces, or copies of objects in museum collections.

The center hallway combines elements from Tulip Hill (c. 1756 in Maryland) and The Lindens (c. 1754 in Danvers, Massachusetts). The stairway is composed of more than 1,000 pieces and the railing cap alone took 50 hours to make. The hand-painted wallpaper depicts 18th century houses. Heather Stewart Diaz spent more than a year on the watercolor scenes. The landing holds a tall case clock and the corner cupboard in the entryway holds a matched set of Imari bowls made especially for the house. No corner was left untouched!