A flat panel and a curved frame are not automatically a compatible pair. Tightening the fasteners may close the gap, but it also changes the panel shape and the forces in the assembly. That installed condition needs to be part of the design discussion.
Closing a gap is not the same as fitting freely
Check the panel against the mating surface before tightening it. Record where it first contacts and where gaps remain. A nominally flat part forced around a frame can carry assembly-induced stress before any service load is applied. The effect depends on the curvature, laminate, thickness and fastening arrangement, so appearance alone cannot settle suitability.
Three routes worth comparing
A molded curved panel can match the intended shape without relying on fasteners to create it. A flat panel on stand-offs may avoid the curved contact surface altogether. A panel specifically designed to flex during installation is another possibility, but that flexibility must be assessed for the application. These routes have different tooling, clearance and service implications; they should be compared on those terms.
Use the real frame geometry
A broad description such as “slightly curved” is not enough. Supply the frame model or a useful cross-section and show which surface controls the fit. Check whether the frame itself changes shape when mounted. Pads, finishes and local bosses also change the contact condition, particularly if the panel rests on several separated points.
A sample fit should show the process
If installation involves progressive tightening or a defined sequence, record it along with the hardware and any approved limits. Do not invent a torque from the panel material or use increased torque to conceal an unresolved gap. For a production handover, retain photographs before and after assembly and note any agreed stand-off arrangement. Those records make the intended fitted shape easier to reproduce.
For the project review: free shape and installed shape; frame sections and contact points; stand-off or molded-shape alternative; approved assembly arrangement.