eval() was the best solution i could come up with to generating classes dynamic in runtime. not my ideal solution. Here is the code in case anyone would like to use it.

Supports using the relation methods as well. May not be the cleanest of code, But it does get the job done.

<?php

$model_confg = array(
    "Models" =>
        array(array('className'=> "Books", 'classTable'=>'books', "fillable" => "book_name"), array('className'=> "Authors", 'classTable'=>'authors', "fillable" => "")),
    "Relations" =>
    array("Authors" =>
    array("books" =>
        array("function" => function( $self ) {
            return $self->belongsToMany('Books');
        }
        ))));

function eloquent_dym_models($models)
{
    $eval = "";
    foreach ($models as $key => $value) {

        $recordType = $value['className'];
        $recordTable = $value['classTable'];
        $f = $value["fillable"];

        $eval .= "class $recordType extends Illuminate\Database\Eloquent\Model {

    protected \$table = '$recordTable';

    protected \$fillable = [$f];

    public function __call(\$method, \$parameters) {

    \$class_name = class_basename( \$this );

    if(array_key_exists(\$class_name, \$parameters[0])) {
    \$func = \$parameters[0][\$class_name][\$method]['function'];
    return \$func(\$this);
    }

    return parent::__call(\$method, \$parameters);

    }

    }";

    }

    eval($eval);
}

eloquent_dym_models($model_confg['Models']);

$authors = Authors::find(1);


$data['authors'] = $authors->toJson();
$data['books'] = $authors->books($model_confg['Relations'])->get()->toJson();

?>