Modify ElementForm to contain its’ own form builder.

src/Control/ElementFormController.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace DNADesign\Elemental\UserForms\Control;
+
+use DNADesign\Elemental\Controllers\ElementController;
+use SilverStripe\Control\Controller;
+use SilverStripe\UserForms\Control\UserDefinedFormController;
+
+class ElementFormController extends ElementController
+{
+    public function __construct($element = null)
+    {
+        parent::__construct($element);
+
+        $current = Controller::curr();
+
+        if ($current->getRequest()->isPOST()) {
+            // handle the post request.
+            $user = UserDefinedFormController::create($element);
+            $form = $user->Form();
+
+            $user->process($current->getRequest()->postVars(), $form);
+        }
+    }
+}

src/Model/ElementForm.php

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+<?php
+
+namespace DNADesign\Elemental\UserForms\Model;
+
+use SilverStripe\UserForms\Control\UserDefinedFormController;
+use SilverStripe\UserForms\UserForm;
+use SilverStripe\Control\Controller;
+use DNADesign\Elemental\Models\BaseElement;
+use DNADesign\Elemental\UserForms\Control\ElementFormController;
+
+class ElementForm extends BaseElement
+{
+    use UserForm;
+
+    /**
+     * @var string
+     */
+    private static $table_name = 'ElementForm';
+
+    /**
+     * @var string
+     */
+    private static $title = 'Form';
+
+    /**
+     * @var string
+     */
+    private static $icon = 'elemental-userforms/images/form.svg';
+
+    /**
+     * @var string
+     */
+    private static $controller_class = ElementFormController::class;
+
+    public function ElementForm()
+    {
+        $controller = new UserDefinedFormController($this);
+        $current = Controller::curr();
+
+        if ($current && $current->getAction() == 'finished') {
+            return $controller->renderWith('ReceivedFormSubmission');
+        }
+
+        $form = $controller->Form();
+        $form->setFormAction(Controller::join_links(
+            $current->Link(),
+            'element',
+            $this->owner->ID
+        ));
+
+        return $form;
+    }
+
+
+}

templates/DNADesign/Elemental/UserForms/Model/ElementForm.ss

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+<div class="elementform-form">
+    $ElementForm
+</div>