The logic flow can be Interesting°. You can assume that customer flow can be independent, that is not coupled. A faxed in order can be assumed to only grab capacity of the pharmacist, not the cashier. This means that when customers come in, the cashier always services them, but they have an order ready only 59% of the time. We assume this was all covered by a fax in flow. For 41% of the time the cashier services the order once and passes the order to the pharmacist.
You must provide good animation.
You must provide in model documentation with floor labels.
You must provide time plots of the pharmacist queue and customers in the store. Correctly model resource schedule and arrival rates