I am running Pavilion theme with OpenCart 2.

I need to customize the product page.
The product is available here:
http://opencart.olebo.ru/index.php?route=product/product&product_id=61

1. I don’t want “availability: in stock” and “Model Name” fields to be displayed.
How can I do that?

2. Options
I have a rather long list of checkbox-type options (see sample product above).
How can I display options in 2 columns (if at all possible)?

3. Long description
I would like to display short description (e.g. products for a dish: apple, strawbery, milk)
in the product list view (where multiple products are shown) and then on the product details
display a much longer description (more SEO-related).

Trunkating description the way it is supposed to work with Pavilion doesn’t do the job for me.
I really would like to have 2 different texts in product listing and product details page.

Is there a way to use meta-description may be on the product page?

4. As a last resort I may have to custom-design product details page
What is the proper way to integrate that custom-design into the Pavilion theme?