Is this similar to what AppJet originally attempted to do? If so, have you attempted to contact them to see what types of problems they encountered before focusing on EtherPad?
Akshell targets more "heavy" applications than AppJet. E.g., it has a relational database and AppJet had key-value store. I contacted JGate guys. JGate is an AppJet successor http://apps.jgate.de/.