Finish an Unfinished (DIVI Builder) website

We have an unfinished DIVI project that needs to be finished, we have 5 pages to be re-coded in a way to make the pages load faster. This means use the same images and text but improving the layout for faster loading. We have the source website in it's original template and plugins.

The mobile version menu needs to be done differently to the desktop, we need the mobile menu to be done by the Divi builder (Elegant Themes) and not by a plugin.

A summary of the main things that need to be done:

1. Re-code 5 pages with minimum J queries and minimum CSS (These pages will be giving when you start the task)
2. Fix cart item count issue
3. Cart page not displaying all images and text as original template (Must fix this issue)
4. Menu bar must be adjusted and made 100% functional
5. Small menu buttons not displaying properly
6. Some buttons/icons not displaying properly (Must fix this issue)
7. Some product pages not displaying properly (Must fix this issue)
8. Adjust and configure Ajax search bar.
9. Website Colour palette must be adjusted to match logo colours
10. Fix any issues that may arise from fixing any of the above issues

This task requires some basic knowledge of best page optimization for fast loading. If this project is within your capabilities. Please bid!!