Good review: http://www.co-design.co.uk/design.htm
- Use standard screws, bolts, and nuts to accommodate standard hand tools
- Make screw and bolt heads accessible to tools
- Where not necessary, don't glue/weld/fasten things permanently.
- Create access ports, doors, panels, etc.
- When components will be replaced, attach them with clips, mounts, sockets, etc.
- Use Quick Couplers