I am making a custom pc design and i need some help

[lolkarl10002]

So i am making a custom pc design, nothing too special, yet i am having a hard time getting all of the components mounting right. The hardest so far are the gpu expansion slots. Does anyone have the dimensions for those?

 

[Eximo]

https://www.protocase.com/resources/how-to-design-for-motherboards/figure-14-2.jpg

https://www.protocase.com/resources/how-to-design-for-motherboards/

There are others like that out there. Search for ATX mechanical drawings or blueprints.