Kevin Bauman I have not heard back from the architect, but after searching online a bit, there did seem to be a couple of options. I saw several listed on alibaba.com, as well as jeld-wen.com. I hope this helps!
Rustica Hardware We make a Bypass Barn Door Hardware that allows up to 3 doors to slide in front or back of each other. This one shows 4 doors the farthest one to the right possibly is permanent the other 3 slide. We can customize your order to fit your needs exactly. Go to: http://rusticahardware.com/bypass-barn-door-hardware-system/