A look inside the Cristiofori harpsichord
The internal structure of this harpsichord is closely related to Cristofori's pianos. To the left is a composite of two photographs taken inside the instrument, showing the brace and wall structure. The left image is looking toward the tail along the bentside; in the right image the camera has been turned 180 degrees to look along the bentside towards the belly rail. Note the recycled wood used for a buttress brace in the right image. Note also the cut nails sticking through the case wall: these hold the exterior case (along with glue) to the interior case. Analysis of the photographs taken of the interior and detailed comparison with existing instruments firmly establish that this harpsichord can be attributed to Bartolomeo Cristofori.
The buttress braces transfer the stress load from the bentside inner case across the instrument's interior to the base of the spine. Using braces fitted into sockets in the case liner is a characteristic of larger Cristofori instruments. The instrument's 4.7mm thick flat sawn cypress soundboard is laced with a complex series of ribs, producing an extremely rigid and resonant soundboard blessed with great stability.
The harpsichord's original jacks (at left) are slightly tapered, with walnut bodies, brass leaf springs and beech tongues morticed for leather plectra. The design, manufacture and numbering of these jacks is consistent with known Cristofori examples - Leipzig catalog number 84, for instance.
Another typical Cristofori design motif is the scroll cut keywell end block, virtually identical in all respects to Leipzig Cat. Nos. 84 and 89 and the 1720 Cristofori fortepiano in the Metropolitan Museum in New York. While there are similar cheek scroll in instruments by other makers, Cristofori's appear to be unique and consistent to his shop. The keyboard has boxwood covered naturals and black-stained sharps; it was modified at some point early on, and may have been originally intended for another instrument. 
This instrument's design and structure are completely described and analyzed in an article "A Florentine Harpsichord - A Transitional Technology Uncovered" in the February, 1998 issue of the quarterly journal EARLY MUSIC (Oxford).