Okay, I can help you set up the basic structure and styling for a high-quality engineering website with a marketplace section.

This will include:

1. An index.html file for the structure.
2. A style.css file for styling and responsiveness.
3. A script.js file for the marketplace icon interaction.

This sets up the basic HTML structure, CSS for a professional and responsive look with an engineering theme, and JavaScript for the mobile menu and simple marketplace icon interaction. You can view this by opening the index.html file.