Here's a simple, real-world example of implementation and extension of models and presenters.

Model.php

<?php namespace Acme\Core;

use Eloquent;

class Model extends Eloquent {} 

PresentableModel.php

<?php namespace Acme\Core;

use McCool\LaravelAutoPresenter\PresenterInterface;

class PresentableModel extends Model implements PresenterInterface {

    /**
     * Return the class name for our presenter. By default this will
     * look for a presenter class based of the name of the model. You can override
     * this in the model you create.
     * 
     * Example: Acme\Reports\Report.php would use Acme\Reports\ReportPresenter.php
     *
     * @return string
     */
    public function getPresenter()
    {
        // Return the presenter class name.
        //
        return static::class . 'Presenter';
    }
} 

Presenter.php

<?php namespace Acme\Core;

use McCool\LaravelAutoPresenter\BasePresenter;

class Presenter extends BasePresenter {}

Report.php

<?php namespace Acme\Reports;

use Acme\Core\PresentableModel;

class Report extends PresentableModel {

}

ReportPresenter.php

<?php namespace Acme\Reports;

use Acme\Core\Presenter;

class ReportPresenter extends Presenter {

    /**
     * Create new ReportPresenter instance.
     
     * @param Report $reports
     */
    public function __construct( Report $reports )
    {
        $this->resource = $reports;
    }

}