Each of my ukuleles is hand made. This does not mean that I do not use power tools. I do. In addition to rasps, wood chisels, clamps, dovetail saws, jigs and the like, my small shop possesses the usual woodworking machinery such as band saws, table saws, drill presses, planers and drum sanders. Most of my instruments have:
Arched backs (lengthwise and widthwise) for better resonance.
Mortise and tenon neck joints.
A carbon fiber rod sandwiched between the fretboard and the neck, which has the dual benefits of enhancing neck stability and facilitating construction of the mortise and tenon neck joint.
Hand-carved necks.