That's a pretty large case. Just how many drives do you have?
The power supply in the 9500 is one of Apple's beefier ones, so you should have no problems with power. First you'll need to look up the pinout of the power supply connector and work out which pins you need to short to start up the PS. Then wire those pins to a switch.
What RAID type are you going to run? IIRC, there is one external SCSI connector cutout on the back of the 9500. You could mount one SCSI connector there, and if you want to avoid cutting the case, use the PCI slot covers as mounting points for any further connectors required.
Internal mounting and cabling is probably best worked out as you go along, and have everything in front of you.
The power supply in the 9500 is one of Apple's beefier ones, so you should have no problems with power. First you'll need to look up the pinout of the power supply connector and work out which pins you need to short to start up the PS. Then wire those pins to a switch.
What RAID type are you going to run? IIRC, there is one external SCSI connector cutout on the back of the 9500. You could mount one SCSI connector there, and if you want to avoid cutting the case, use the PCI slot covers as mounting points for any further connectors required.
Internal mounting and cabling is probably best worked out as you go along, and have everything in front of you.