A financial model is most useful when it shows a range of outcomes and the assumptions underneath them. One polished projection can create false precision. I would rather see three cases that explain what drives the business and how the owner would respond when reality differs from the plan.
Start with the operating engine. How do customers arrive, what do they buy, how often do they return, and how much can the team deliver? Then show the full bridge from revenue through labor, occupancy, fees, marketing, management, debt, taxes, and reinvestment.
The working case should reflect assumptions you can explain. The conservative case should change the few variables that matter most, such as the sales ramp, labor, opening timing, or manager cost. It is not designed to be discouraging. It shows what liquidity and leadership the plan may require if progress takes longer.
The stronger case needs discipline too. More demand may require additional staff, equipment, space, or management. Planning for success is part of diligence. A good model does not predict one answer. It shows what must be true across a range and gives the owner a plan for acting on what happens.
Build a model that helps you lead the outcome, not one that simply predicts it.