Cake Pattern & Akka = Serialization issues?

Question

Problem: I have used the cake pattern to build a system of components (traits) which define a family of types and specialise them covariantly (cf., family polymorphism). Then I have defined a component which defines some actors and messages to be exchanged among these actors.

trait BasicTypes {
    type T1 <: T1Interface
    type T2 <: T2Interface

    // other stuff
}

trait MyActors { self: BasicTypes =>
  case class Msg1(v1: T1, v2: T2)
  case class Msg2(name: String)

  class MyActor { ... }
}

The problem is that the cake gets larger, possibly including non-serializable stuff. The result is a number of akka.remote.MessageSerializer$SerializationExceptions.

Questions:

• Is there any way to fix this without flattening the design (i.e., while keeping the Cake pattern)?
• May I implement custom serialisation using writeObject and readObject for case classes?
• How can I avoid the serialisation of the 'outer object' of my messages?