theme ALL form elements in a tpl through hook_preprocess_HOOK Trying to theme a form into all the pieces available, passed my $form and $vars through hook_preprocess_HOOK but in my tpl i would like the exact render() representation of the fields and variables and the form itself like: 

print $form_tag.
      $form_input1.
      $form_input2.
      $theme_var1.
      $form_closure; &lt;!-- build_id,token_id --&gt;
 ?&gt;


Where there are declared in the preprosess_HOOK as

$form = $variables['form'];
$variables['form_tag'] = render($form); 
$variables['form_input1'] = render($form['input1']);
$variables['closure'] = drupal_render_children($form);
...


Is it possible to have all this variables of produced HTML in my tpl?
 like form start tag and closure and render correctly all the inner fields?
Thank you
I am not sure if this is what you are trying to do. But from the question I feel that you just want to re arrange the form in an order of your choice.

The best place to do that is with in a hook_form_alter function. Rather than the preprocess_HOOK.

Every form element has a property called #weight This could be used to arrange the forms in order the one with higher weight would go down.