Nope, did not think about it yet. Actually it will be running on my Raspberry Pi in the end. But if I had to scale it, I would probably try putting tesseract in

Nope, did not think about it yet. Actually it will be running on my Raspberry Pi in the end. But if I had to scale it, I would probably try putting tesseract into a docker container and start N instances with docker-swarm. The output would go into a shared local volume or even S3. Should be more than enough to scale to a very large cluster.