$tmpModel = 'tempModel';
$tmpTable = 'temp_models';

$this->Model->query('CREATE TEMPORARY TABLE `'.$tmpTable ... );
$this->loadModel($tmpModel);

$tmpModel = 'tempModel';
$tmpTable = 'temp_models';

$this->Model->query('CREATE TEMPORARY TABLE `'.$tmpTable ... );
App::import('Model', $tmpModel);
$this->loadModel($tmpModel);