The AWS entry level welder book has specific references to shop size, lighting, equipment, etc....... It is very specific. The AWS SENSE coordinator can hook you up. Her name is D. Hevia

I know how much hassle it is to get the book so I brought one home today and here is the low down;
100' square lab space per individual suggested excluding classroom, storage, office.
75' per indiv min.
100 foot candles lighting minimum
For more reccomendations by AWS refer to the book