Now that we have all the mounting plates identified and in the correct order let's get the MCR boards installed.
Lay out some bubbles wrap or something to protect the boards while you work. Lay out your PCB boards as shown.
Next grab the sound board plate and flip it over so that the back side is facing up. Then slide it carefully underneath the CPU PCB.
Plate and PCB notches should line up on top.
Next grab your CPU plate and flip that so the back side is facing up and place that on top your CPU PCB. Line up the mounting post and use 4 long machine screws to secure. Just snug don't over torque the screws.
When your done with this step it should look like this.
Next is to flip your GPU / video PCB over (solder side facing up) and place it on top of the plate as shown here.
Next take the GPU / video plate and flip that over so the back (flush) side is facing up. Align the PCB mounting holes and secure using the remaining 4 long machine screw. Again, don't overtightened.
Should look like this when done
Now carefully flip the entire assembly over and flold the sound board PCB on top.
Align the PCB with the mounting holes and use the 4 small machine screws to secure the board.
Everything should line up and you can check by the notches up top.
Hope this helps others.