Offer a drawing as an example, and one immediately opens oneself up to (constructive) criticism.
My only nitpick would be that, for an
arena or blackbox design, the pipes running SR-SL should be numbered (1,2,3,...) and the pipes running DS-US should be lettered (A,B,C,...). Neither
Shelley's A Practical Guide to Stage Lighting nor
Warfel's Handbook of Stage Lighting Graphics appear to mention this, but I know it's in one of the more popular texts. That fact notwithstanding, I would recommend either or both of the books above (or better, their most recent editions) to
Corbettlight.
EDIT: Also, on any drawing that will be distributed electronically (ALL of them in today's PDF age), I would include X and Y-axis scale rules, and include the phrase "Scale: 1/2"=1'-0" UNLESS reproduced," as one loses control of printing ratio.