Here I've collected some technical diagrams of equipment, aliens, robots, etc. These have all been scanned by me from various books and other sources.
Dalek - anatomy of imperial dalek w/ labels (color) Dalek - cross-section of standard dalek (b&w) K9 - cross-section (b&w) Sonic Screwdriver - anatomy w/ labels (color) Sonic Screwdriver - diagram of outside (b&w)