I also was thinking to use this....Rosewill RSV-SATA-Cage-34 - Hard Disk Drives - Black, 3 x 5.25" to 4 x 3.5" Hot-Swap - SATA III / SAS - Cage for backup

The Samsung 970 SSD sets in a slot on the motherboard.

I am also replacing the two 250 HP yamaha outboards with 300HP.. I got no issue with over kill!

Just to make it clear, all internal drives will be SSD.