I downloaded the installer from MAS, made the USB stick, and installed onto an external SSD scratch drive just to test everything to completion. I booted into the Recovery Partition to see what the deal was with SIP. It is still no longer a GUI menu option, but running the command 'csrutil status' in a Terminal showed it to be disabled. When I rebooted back into the main OS, the terminal command showed it is disabled. Anyone else seeing this?