Could we host an exchange on a cloud account at IBM Bluemix?  We could modify the smart contracts of Hyperledger Marbles to create a cryptocurrency exchange and host it in the IBM Cloud.  In that way we could also get help from the Hyperledger developers.  Hyperledger uses Node RED, which is a really cool way to construct smart applications for the cloud. It makes it easy to add sensors, IoT and API's to your program.