Try roles/www_back_end in Stage 3 & roles/www_front_end in Stage 4

roles/nginx/tasks/enable-or-disable.yml

@@ -6,13 +6,13 @@
 - name: Install /etc/{{ apache_service }}/ports.conf from template 1 of 2 (ports.conf.j2) if nginx_enabled, to enable Apache port {{ apache_port }} localhost only
   template:
     src: ports.conf.j2
-    dest: "/etc/{{ apache_service }}/ports.conf"    # apache2 or httpd
+    dest: "/etc/{{ apache_service }}/ports.conf"
   when: nginx_enabled | bool
 
 - name: Install /etc/{{ apache_service }}/ports.conf from template 2 of 2 (stock-apache-ports.conf) if not nginx_enabled, to disable Apache port {{ apache_port }} localhost only
   template:
     src: stock-apache-ports.conf
-    dest: "/etc/{{ apache_service }}/ports.conf"    # apache2 or httpd
+    dest: "/etc/{{ apache_service }}/ports.conf"
   when: not nginx_enabled
 
 - name: Enable & Restart '{{ apache_service }}' if apache_enabled or not nginx_enabled, since we stopped it

roles/nginx/tasks/homepage.yml

@@ -0,0 +1,9 @@
+# Both invoked in 4-SERVER-OPTIONS, by roles/www_front_end/tasks/main.yml:
+#
+# httpd/tasks/homepage.yml
+# nginx/tasks/homepage.yml
+
+- name: Install {{ nginx_conf_dir }}/iiab.conf from nginx/templates, so NGINX redirects http://box to http://box{{ iiab_home_url }}    # /home
+  template:
+    src: roles/nginx/templates/iiab.conf.j2
+    dest: "{{ nginx_conf_dir }}/iiab.conf"    # /etc/nginx/conf.d

roles/nginx/tasks/install.yml

@@ -35,7 +35,7 @@
     path: /etc/nginx/sites-enabled/default
     state: absent
 
-- name: 'Install 3 files from template: /etc/nginx/server.conf, /etc/nginx/nginx.conf, {{ nginx_conf_dir }}/iiab.conf'
+- name: 'Install 2 (of 4) files from template: /etc/nginx/server.conf, /etc/nginx/nginx.conf'
   template:
     src: "{{ item.src }}"
     dest: "{{ item.dest }}"
@@ -43,9 +43,13 @@
     - { src: 'server.conf.j2', dest: '/etc/nginx/server.conf' }
     - { src: 'nginx.conf.j2', dest: '/etc/nginx/nginx.conf' }
     #- { src: 'ports.conf.j2', dest: '/etc/{{ apache_service }}/ports.conf' }    # Moved to enable-or-disable.yml
-    - { src: 'iiab.conf.j2', dest: "{{ nginx_conf_dir }}/iiab.conf" }    # /etc/nginx/conf.d
+    #- { src: 'iiab.conf.j2', dest: "{{ nginx_conf_dir }}/iiab.conf" }    # Moved into homepage.yml below
 
-# php-stem extension installed by roles/web_support/tasks/php-stem.yml
+- debug:
+    msg: roles/nginx/tasks/homepage.yml will run LATER (invoked by roles/www_front_end/tasks/main.yml) SO THAT NGINX CAN REDIRECT http://box TO http://box{{ iiab_home_url }} (based on var iiab_home_url)
+# - include_tasks: roles/nginx/tasks/homepage.yml
+
+# php-stem extension installed by roles/www_back_end/tasks/php-stem.yml
 # here it is linked to php-fpm
 - name: Symlink /etc/php/{{ php_version }}/fpm/conf.d/20-stem.ini -> /etc/php/{{ php_version }}/mods-available/stem.ini
   file: