Yeah, it basically has to have all the rivet and screw holes in the exact spots that they are in the oem panel. The only difference is the vents can't be there, and must be replaced with 4.5" holes.
If the design isn't to exact specs, they'll charge me a ton in labor to make any adjustments/retractions/additions. The CAD file I hand them has to be 100% exact and complete.
Is this what you are looking for? I made a side panel with the 3 front and 3 back rivet holes plus the fan holes in Solidworks. In my experience machining things, the other rivet holes you will want to place by hand. The more holes you have cut, the more places for error. The holes I placed shouldn't be too off, but any time you try to duplicate a piece you get error.
Let me know what I should add if this helps at all.