Single.php grid template for images and text

Hi,
I am building a WordPress website for a client. They have a specific request which I’m not sure how to realize. I hope you can help me find a solution:
I need a Post template which the client can fill with 5 images and a block of text, in a specific layout. I don’t want them to have to insert the images inbetween PHP/HTML code, so I’m looking to create a single.php template with a grid, where all the content manager has to do is create a new post, enter the 5 images and the text, and it is automatically translated to an A4 layout. But how are the images and text going to end up in their predetermined locations?
I appreciate any help, thanks!