All original wood including die cut mahogany, balsa andplywood. The full size plan/instruction sheet is yellowed and bug eaten but perfectly readable and useable (see pictures). It has been repaired in several places with magic mending tape. Those of you who are familiar with these old Sterling kits know the wood quality is not so great sometimes. Experienced modelers will want to replace it with better quality materials.
I built a model of the Sea Maid see. Photo using these original parts as patterns for parts made from modern, high quality wood. It is the model I built using the patterns mentioned.