Modify Shopify Product Page

Hello,

I would like to modify my Shopify product page according to the attached sketch and reference sites.

My main addition is to have the product images appear as a grid as represented, also including one video and additional product descriptions besides the main description. So when I add or edit a product, there should be the ability to include multiple product images, a product video, and multiple descriptions, each of which appears as represented in the attached diagram.

The layout for the images and descriptions are fixed, as show in the diagram. The layout should support mobile as represented in the attached reference.

My site is currently at https://omata.com for reference.