Freeze the equipment reference
Start the RFQ with the exact projector reference, the transport orientation and a dated dimension sheet. Record the body separately from removable accessories, connectors and controls, and attach marked photos so supplier and buyer use the same baseline.
Before sending the file, ask the internal user to mark any item that is optional or exchanged between jobs. Keeping those variants outside the core dimension set helps the supplier quote the declared scope and makes later changes easy to identify.
Map fit, access and no-contact zones
A maximum length, width and height set does not explain how the projector is handled. Add a simple view for cable access, ventilation openings, controls and surfaces that must remain clear, then identify which dimensions are fixed and which depend on the packed setup.
Give each access zone a short label and repeat that label on the RFQ, drawing comments and approval sheet. This small document rule lets a buyer point to one exact requirement when a supplier question arrives, without inventing a feature that the catalogue does not state.
Build the RFQ around verified scope
The verified catalogue identifies this as a custom Projector RZ120 Flight Case with a reinforced structure, protective hardware and OEM/ODM B2B customization support. Ask the quotation and drawing to identify how those stated elements relate to your dimension sheet; treat any other feature as a point to confirm, not an assumed specification.
Review the transport workflow before sign-off
Walk through packing, closing, moving and removal with the people who will use the case. Convert their comments into a short approval list covering equipment reference, orientation, access zones, drawing revision and named buyer sign-off, so purchasing and production review the same document.