This is a bare motherboard based off of the specifications for ATX and mATX from formfactors.org. Each hole is 0.156 inches in diameter (0.078 inch radius). The motherboard is 12 by 9.6 inches. It is 1/16 thick (formfactors.org states the thickness should be 0.62 inches but it should be 0.625 which is equivalent to 1/16. Some specifications from formfactors.org are rounded). There's a 9.6 inch line that shows the size of a mATX board on it. Enjoy!
Any requests can be made to my e-mail (firstname.lastname@example.org). One thing I may do is add colored circles for the hole placements because some people may not know which holes are for mATX and which for ATX. It would be rather inconvenient but I'll see how this goes for now. Cheers!
HybridCore of Overclock.net