The standard scales are 2 octaves, C-C-C with F#s — OR — C-C-C plus high D and E (no F#s). The most commonly used tunings are Equal Temperament — OR — Just Intonation, C=0. Other tunings (JI C+20, JI C+8) are available and can be factored in to the final tuning of your keys.
KEY MATERIALS GENERALLY AVAILABLE
Brazilian Cherry (Jatoba) (photo at top)
American Cherry (above)
Side rails: cabinet-grade plywood with a cherry veneer, end caps of solid cherry