I am not sure if it will do but I have 500 series 1, s and 6 slot. However, in reality these have one additional slot. So 1 slot is actually 2 slot. I also have a card edge connector adapter card for connection to the card edge connector. Alternatively don't use the card edge connector and hard wire directly to the PCB.
https://groupdiy.com/index.php?topic=52462.0
It may also be of interest that I also have a modular power supply. So, you can use 3 slot rack which is actually 4 slot. Two slots will take up the power supply and the other two for your modules. See below image.