Explain what a standard arrangement cannot resolve
Custom engineering starts with the requirement: a site constraint, a material-handling need, an interface or an operating workflow. Describe the reason for the change and the equipment around it, rather than prescribing a modification without its context.
Define the boundaries of the work
The review can cover the working configuration, feeding and discharge arrangement, utilities, control interfaces and factory integration. Each requested change is assessed against the agreed process and the information available. A request for customization does not establish technical feasibility by itself.
Document what must be accepted
Include sketches, site dimensions and interface descriptions when available. Identify the operating requirement and how the proposed result should be reviewed. This creates a clearer basis for scope, responsibilities and project-specific acceptance.