Need very simple flat shape, can provide photoshop file to scale

I have been doing 3d for some time but I am unable to find how to assign real measurements to a 3d object.

I need a 6 inches by 6 inches flat square with a 3mm base and small 2mm pegboard coming out every 5 mm apart.
Something like this showing the pegs spacing: http://i00.i.aliimg.com/wsphoto/v1/419738038_1/free-shipping -BP02-square-pegboards-patterns-for-hama-beads-perler-beads- DIY-educational-toy.jpg

I can supply a flat photoshop file with proper measurements and you would only have to extrude it then provide the file in a format I can give to my local 3D printer preferably something I can import into AliasDesign

Let me know how much you would charge for this

It took me all of five minutes.
Gratis

Thank you and nicely done.

Can I ask what app you are using to make your models?

AutoCad, That's why I gave you a dwg file. You wanted a file that could be read by AliasDesign