I guess you are thinking too hard, in simple term you can...

I guess you are thinking too hard, in simple term you can compare dividend as part of your salary, and franking credit as tax already paid, does not matter how many times in a year you get, your final calculation will be when you file your yearly return unless you trade on ABN.
Both divi and franking credit do show automatically in ATO when you login to file your return.
Stock trade loss/profit calculation is where it's based on entirely what you enter and ATO check that against CGT events for your TFN.
its not too complicated but based on questions you are asking better to get it done by a Tax Agent and leave all the worries with him/her.
Not a financial advice, do your own research.