The on-board controller will handle 2 drives as Master-Slave without adding a drive to the slower bus that drives the CD/DVD on a Sawtooth, the cables and mounts are there already. If you want a cheapie, buy Marathon G4 rack kit for the existing case.

A 2 U case holds a full size 5.25 CD/DVD with no problem so I don't see the need for a slot load unless you want more headaches.

I'm building 1 myself but can't get a riser to work right and I have cable lenght issues, I do have it booting from the ATX power supply but its too ugly to post yet!

Good luck, just keep it simple