Choice of wood is important.
Beech is excellent for hardwearing parts needing strength like small cams, cam levers, linkage attachments
Birch ply is excellent for making parts which need to be stable without shrinkage or warping such as gear wheels and Geneva Wheel mechanisms.
Lime is a super wood for detailed carving.
Woods like cherry and yew add a decorative touch.
Pine is useful for cases, large cams and gear wheels and cam lever supports.