I do a number of PCB projects, but if the mechanicals are wrong, the prototype fee is wasted.
So I have started cutting mechanical prototypes in acrylic. I can go from the layout program to Corel.
Here's a sample:
http://mrtn.smugmug.com/gallery/7723...99170858_rSPYx
Useful to check mounting holes, clearances and connectors. If you have people who do PCB work, they might appreciate this as a quick validation.