What you need to do:
Do a prototype implementation of your project. This should include the necessary classes for your project, important variables, and basic formulas and functions. It should prompt the user for the necessary inputs, compute some relevant values, and print out some results. It does not need to include graphics at this point but you should thing about (and perhaps comment in the code) where the graphics would go in the program and what you would display.
Remember that this is a two-week assignment. What you turn in should represent two weeks worth of work (twice as much as an other assignments) and should include the basic program elements that you learned about from those other assignments, including classes, input/output, error checking, functions, etc.