Hello Lyndrea,
I can see that your site is pretty solid and everything is set up and working perfectly and what is only lacking is mobile responsiveness.
I can see at least 30 pages, including an interactive, and pretty well thought out search on "Louvre", "Screens" and "Projects" pages.
As you requested, the site would be full-width after completing the responsive feature.
The menus will auto adjust as well and will have the "3-dashes" icon when on mobile.
I see this requiring roughly 55 man hours.
I would setup a development site on my server so your current site won't be affected in any way while the development is in progress. Once the responsive feature is in full effect and you approve, only then I will apply the changes to the current site, and would do so on Australian late hours so minimal people will get affected when the changes are being applied.
About me: Full-time freelance web developer proficient in HTML, CSS, Bootstrap, jQuery, PHP, MySQL and Wordpress.
Looking forward to getting some feedback from you soon.
darkwind