Here is what I did to solve my problem:
I purchased 2 Vantec USB 3.0 external Enclosures for SATA Blu-Ray/CD/DVD drives. I then stacked them
on top of each other and put strips on the 4 corners of the top of one and the bottom of the other. That way
they can be taken apart if desired.
This procedure looks exactly like 1 unit. Had to use 2 power cords and USB cables of course.
This might give someone else an idea if they want to make up a 2 bay usb 3.0 enclosure.