The crew
You only ever talk to Earl. When it's the calendar, the money, or the shelves, he asks the specialist and brings back the answer. When one thing needs three of them, he hands it to all three at once.
Runs the office. Answers you, calls the crew, writes the quotes and invoices, keeps every customer straight, and asks the others when it's their department.
The calendar. Who's where each day, what's booked, what's open, and who to move when a job runs long.
Hours, pay, unpaid invoices, and what a job actually cost. Only the owner ever talks to Money.
One per place you keep things. What's on the shelves, what went out to which job, and what to reorder before it runs out. One is in every plan; another warehouse or a truck is $10 a month.
The business's email. Every email to the business's address lands with him: he files receipts, notes new customers, hands bookings and quotes to Earl, and replies only when you say so, in the same chain.
The filing cabinet. Say what to keep and where: a quote, an invoice, a receipt, a permit, a photo. Ask for anything on file and he pulls it up.
How they work together
Say "book the Millers' kitchen Tuesday to Thursday with Mike and Danny, pull forty boxes of flooring, file the contract, and email the Millers the plan," and Earl briefs the Scheduler, Money, Storage, Files, and Mail in the same breath. Each one does its part, they compare notes where it matters (the hours booked become the pay worked out), and Earl brings you one answer. Measured against doing it one at a time: 37% faster and half the cost.
Employees talk to Earl too, and see the calendar, the stock, and their own hours. Money only ever answers the owner.