Another day another C5 question..

I have followed 5.7 guidance on customising system single pages (link below) and have had no issues... that is until I got to the maintenance page. The article kind if implies this should follow the same process but I gather from the core file structure that maintenance_mode.php is a special case. I get this from the fact that login/register/page_not_found etc are all in the `concrete/single_pages` folder and if I update `application/config/app.php` these are very easily overridden by files of the same name in my theme directory. All good. However maintenance_mode.php lives in`concrete/views/frontend' and the entry in the app.php file makes no difference. So to summarise can anyone shed any light on how I can override the maintenance_mode.php view file in C5 v5.7?

http://www.concrete5.org/documentation/developers/5.7/designing-for...