The high demand and shortage of surgical and N95 mask has lead many group to improvise and build their own. It's not clear who will be accepting DIY shields and masks since the mask and shields haven't been qualified. The links below are a random sample of the active projects.
Boston Children's Hospital
Christina Cyr at tdoor.com provides info on 3D printing shields
Adafruit Shield design
Cornell Weill Medicine
Linus Tech Tips