Imported the original designs into tinkercad, after much slicing, cutting, rearranging, pasting, and joining...you see the result
I recommend a USB to SATA Portable Adapter it can be 2.0 or 3.0 mainly because the choke point for data flow will always be the 100Mb/s transfer thru the network connection
I recommend DietPi as the OS, but Armbian is very very good as well
-edit-07/07/2019  found a VERY stable NAS server distro for Orange Pi PC called OpenMediaVault download here developed by the guy who develops Armbian...I can say it installed and runs stable as can be!!!!
I plan on using one of the packages in DietPi to setup a personal headless "cloud" server to be able to upload photos remotely to save space on my phone, also could be a NAS or whatever
-Update 08/07/17 found I had reversed the daggum layer..the USB and the Ethernet were on the wrong side for the opening of the harddrive, corrected.  Added a vent from the OPi PC to the harddrive for airflow...the OPi PC fits too snugly into the case lid and would…