Sorry for the delay on this. I haven't been home. Pics of it mounted on the standoffs are below. As you can see each board is mounted on a single standoff. This is because neither the RPi nor the ATX-Pi are large enough to straddle two standoffs that line up with the provided holes. The second screw you see on the RPi actually isn't in the board, it's just holding the board in place for me for it doesn't move around. There is a standoff under it and the SDcard is just placed under it so the head of the screw rests on top of it.
Additionally one minor issue I had is that the holes on the ATX-Pi are too small for standard standoff screws. I initially tried to mount it by the hole next to the power switch pins. Bad idea. That edges is too thin around two sides of the hole. But I did that first because there was nothing on the board in that area that could be damaged. So, don't do this. Get yourself a smaller screw that fits through the hole and put a little Gorilla Glue in the standoff itself. Don't fill the whole standoff, just enough for the screw to reach it and push the glue up a little bit around a few threads. As long as you don't put enough in that it comes up and touches the board then it's fairly easy to unmount the board should you need to in the future. That little tiny bit of glue is strong enough to hold everything in place. But if you apply a little pressure with a screwdriver then you can easily break the seal later. There are better ways to mount this if you order the parts I'm sure. But I worked with what I had around my house.
I plan to put my klondike-16s in the 5.25 and 3.5 bays using adapters from
https://cp.virtualvm.com/cart.php (
https://bitcointalk.org/index.php?topic=246638.0)
Luckily the extra case I am using has a external LED temp display and a wired sensor which you can see laying between the boards. Case fans and this display will also be run off the power supply that is powering everything so it should be a nice and neat self contained system.
Pictures:
http://imgur.com/St8utsm,voSKWow,YLEIUrIIs it perfect? Nope. But it does the job. Let me know if you have any questions.
Edit: Oops, pictures way too big to put directly in the thread.
