We have a concept we call our "Bus Number." It's the number of people that know how to do what you do, or have been briefed on what you're doing, so that if you're run over by a bus, they can pick up what you're doing. It's a grim concept, but it highlights another point: what happens during the startup period should a key person fall ill, or die? Good documentation could save the shop and make sure your dream lives, at least for a while longer.