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Perforated sheet metal
I am currently making a sheet metal cover for a processor unit that needs to be ventilated, so I decided on using perforated sheet metal. I would therfore like the modelled part to reflect the material from which it is made, both visually and parametrically.
The raw material has 3mm dia holes on a 5mm pitch as per http://www.novametals.co.uk/pdf/rh/304/r3_0t5_0.pdf
I thought I could model up the box and then pattern fill the flat form representation at the end, but I can't find a way of adding a feature to the flat form representation. 
Any ideas?
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