Right now we're working on the GPIF code and the isochronous stream
setup code, I'm sure it will still take a while until everything is
working flawlessly...
How would a unit be obtainable, what construction would be necessary and
is there an estimate of cost?
In the low quantities (20pcs) we built we spent a little more than
100EUR per board. Since we got some parts as free samples this is
probably not a good estimate, check the BOM to get a more exact idea.
Right now you have to build one on your own - you can get parts and PCBs
from us or order them on your own...