I am currently shooting with an on camera 580EXII and bouncing it off of the ceiling with the guitars laying flat on a table. I do have 3 other speed lights and radio triggers. I also have 2 continuous lights that each 4 bulbs in them on 4 different switches.
My biggest issue is avoiding reflections from the bare fluorescent light tubes hanging from the ceiling in the shop and I cannot take the guitars anywhere. He does not want reflections because the instruments are purposely made to look as if all the original gloss has worn off over a long time. He wants to see the cracks in the finish and the worn appearance of the metal parts that make the guitars look aged.
I do want to produce quality work but also I am trying to keep this as simple as possible....the location is 20 miles away, the volume of work is low and the money doesn't justify setting up an elaborate system each time.