Nutshell and Shellback kits are made from Sapele mahogany, with parts pre-cut. Kits include a slotted building jig, plans, hardware, epoxy, and book. The sailing version has all the bits of the rowing, plus rudder, tiller, daggerboard items, rigging materials, and spars shaped to 4 sides, and they are not scarfed. Delivery timing is approximately 4-8 weeks, and shipping (to the lower 48 states only) is charged separately. Shipping might cost $250-$600 depending on destination. Pre-cut kits are shipped from Maryland, by the good folks at CLC boats.
If you're thinking about building from "scratch" i.e., from plans instead of a kit, you can get plans for either the 7'7" or the 9'6" Nutshell Prams, as well as the Shellback Dinghy directly from us. See the Plans - Boatbuilding section of our site. Look under the tenders/prams and the Sailing-Pulling Boats sections.