This is the suggested addon structure for Streams Platform packages and addons.

suggested-class-structure.txt

src/
    Foo/FooModel
    Foo/FooCollection           // Transformed collection for FooModel
    Foo/FooPresenter            // Transformed presenter for FooModel
    Foo/FooObserver             // Observers can not be transformed
    Foo/Table/FooTableBuilder   // Assumes Foo/FooModel for $model property
    Foo/Table/FooTableColumns   // Handler for FooTableBuilder->columns
    Foo/Form/FooFormBuilder     // Assumes Foo/FooModel for $model property
    Foo/Form/FooFormSections    // Handler for FooFormBuilder->sections