I've worked through the details of mounting an improved card cage for the 9-slot backplane. Use the STL files attached below to create your right and left sides. Everything mounts using the existing holes in the cabinet, so no drilling is needed.
The card cage leaves plenty of room for the components on the backpanel, should you choose to use them. You might have to lean a capacitor over or use small LEDs, but everything will fit if you're mindful during construction.
- Room to mount components on the backpanel PCB
To install the card cage and backpanel, you'll need the following hardware:
(18) M3x20 countersunk screws
(8) M3x10 threaded spacers
(12) M3 nuts
(4) star washers for M3 screws
(20) M3x6 screws (might want more for your power supply)
All 18 holes in the card cage / backpanel assembly use M3x20 countersunk screws. This keeps the screw head flush with the card cage so there's no interference with any circuit boards.
- Use M3x20 countersunk screws to attach the card guides