well, it looks good, but its been my experience that no matter how well you prepare, once you actually get started you'll make at least a few trips to the hardware for stuff you forgot / didn't forsee the need for.
how big is that shed? looks a little small for 4 1k lights. its winter now, how you gonna cool it in the summer? 4 1K hps produce a good amount of heat.
not trying to be critical, just trying to think of things that might pop up down the road