ATX Mounting Holes

[ChalkChalkson]

Reference: I am currently building a Desk PC (ie building a Desk with a computer inside the desk, not below it). But I ran into an information problem when I tried to add all 12 mounting threads as described on page 10 of version 2.2 of the ATX specification... Where are the positions exactly? All my MoBos are only using the holes A,C,F,H,K,L and M.

 

So my question is:

Where are the other holes? ( answers like "G is 12mm down and 24mm right of A" would be extremely helpful)

 

 

EDIT:

for reference http://www.formfactors.org/developer/specs/atx2_2.pdf

[Badazzz]

So from my understanding you're mobo isn't lining up with the holes or what?

[brob]

I believe Fig. 3 of the linked spec (page 12) should be consulted for exact placement measures. The hole labeled Datum 0 (hole A) provides an origin from which all the other holes can be measured. Its center is 0.650" from the left edge and (it's not clear) 0.400" from the rear edge.