Hello WGipps, its very problematic because you satureate USB 2.0 with aprox 6-8 devices so it start be unstable. Even with USB 3.0 it wil be problematic - but for this you need camera with USB 3.0 port.
For best stability and reliability is be?st to use 4 devices per USB port and 2 ports.....
If you plan to build fuulbody scanner its best when ask Lee for consultancy, because he has B I G experience with a lot of devices, setups and technologies.... can save a lot of money because Lee can give a lot of hints what is good, what bad and what great for task like this.... as im have seen few setups last few months, people could save up to 10.000+ USD and have even better results......