Hello there,
I am a professional Technical Architect and Modeller from an engineering background.
I usually work for large corporations where we create complex diagrams of all sorts, using MS VIsio and other more sophisticated tools such as IBM Rational products.
I have vast experience (going back 20 years), creating visually stunning and and contextually accurate Flow charts.
I should be able to do this for you , within a few hours.
Cheers