Load theme tpl after form submit
So I found a solution that works...of course if there's another or better way, I'd love to know.

I added this to my form:

  if (!empty($form_state['nnjob_mtbf']['mtbf_results'])) {
    $form['result'] = array(
      '#markup' =&gt; $form_state['nnjob_mtbf']['mtbf_results'],
    );
  }


And then to my form submit handler:

  $form_state['nnjob_mtbf']['mtbf_results'] = theme('nnreport_client_perf_report', array('parameters' =&gt; $submission));
  $form_state['rebuild']=TRUE;


And voila, template loads like a champ.