The web service wrapper on the server has been cut down to the essence and does not use autoloading for the basic bootstrap. I've found that the PSR approach of a gazillion files each containing a small class and liberal use of autoloading is inherently slow, it is death by a thousand paper cuts due to the high degree of file access, memory consumption and running of all that constructor code. The code i write typically groups a web service in a handful of files, each containing a namespace with the bulk of the implementation in procedural logic (though i do use closures quite a bit). I typically use classes / objects only as types that encapsulate data, with the logic on the object limited to that logic which is necessary for working with that type (e.g. I don't put a save method on an object but instead write a saveObject function which accepts the object as a parameter and passes back an array of errors).
I suppose a lot of people nowadays find that sort of coding style blasphemous, but it is easy to write, test and maintain, and fast to execute. I'm not against the heavy OO approach common in most web dev nowadays, there are times when i do use it and need it. But CRUD web services are very linear: validate the input, create a transaction, run a bunch of db operations, commit or roll back, and return status / errors. If something is linear, i prefer to see it implemented in a cohesive linear procedural style, instead of getting chopped up into lots of objects that in practice end up obfuscating what's happening.
The way of initializing and validating data objects is quite similar to the approach we have in our production code. The missing part is the web service layer that maps the type definitions to a service description (i use reflection of phpdoc comments on a web service class to generate json and soap bindings, similar to the reflection approach in that github project).
I've been meaning to pick it back up and implement both the web service and db layers to make it an all-purpose web dev framework, but i've had other side projects intervene.