Techniques aimed at automating the process planning of complex 2.5D components of the type often encountered in the aerospace and avionics industries are described. The work is based on the ability to extract geometrical data and features from solid models of the components. A characteristic of the simplified approach has been to use 2D data and Booleans where possible to interpret planning problems. The work describes algorithms which validate solid models as 2.5 single or double sided components and select suitable workpiece dimensions. Vise, machine clamping and frame bolting workpiece holding methods are examined. Algorithms capable of determining the best clamping approach are presented.