Well I ran into an issue when I wanted to mount a 7in screen inside of my o11d mini, it blocked the top pcie slot, so I got creative.
I designed the base to mount right to the top of your bottom mounted fans, the hole spacing SHOULD line up. Also included is a pcie cover with holes for two displayport panel mount couplers . These are the ones I used, anything like that should work.
You will also need a Pcie extension cable, I ordered a 300mm one, and it was a bit long for the O11 mini, 200mm is probably better, but you mileage may vary.
-ASSEMBLY-
glue the brackets to the base plate, front bracket goes on the short side, rear bracket on the long side
The Base plate is meant to mount to the middle fan, just use standard fan screws
attach the pcie slot piece to the bracket using 4 short M4 screws
depending on which pcie extension cable you get, you might have to experiment with different length M3 stand offs to mount to the base.
mount your graphics card.
refer to the pictures/model for more clear understand of my poor assembly instructions
you will have to figure out how to run your display cables in a way your comfortable with. I included a pcie slot cover with holes for two display couplers, you could then run short cables to your graphics card, but this step is pretty much up to you.
!!!Designer notes!!! I designed this for my own use, that being said, everything might not line up, may need slight modifaction, I'm not making any promises if this will fit your fans, case, modifications, etc.