Sid "Scroll" Mayeux has over 25 years of experience in aviation training, safety, and risk management in the military, civilian, airline, and general aviation sectors. He currently trains Boeing 777 pilots, and he built and is flying a Van's RV-7A.
If you need to send a part out to be built by a professional shop, a good drawing, well identified, is essential. The KISS principle applies, and be sure you don't request closer tolerances or more exotic materials than you really need, or it will cost you.