Avada Wordpress Theme Customization for Lightbox Slideshow.

I am looking for an experienced programmer who can make the following changes to this website [login to view URL] (wordpress with Avada Theme). Now the lightbox function in Avada is used to show a wordpress native gallery on some articles. e.g. [login to view URL] The lightbox in Avada needs to be changed so that it can show a banner-image below the slideshow. Please check the required result in the attached screenshot. Since the lightbox will be used for galleries in different articles it has to meet the following requirements: - it should be possible to show up to 3 different banners (alternating - but only one per slideshow-image). - it should be possible to show no banner on the slideshows of some articles. So it would be great if I can choose which banners to use for each article. - the slideshow images and the banner should fit into a 13“ display. - please take care that it also works on mobile devices All changes to the theme need to be permanent. So please use a childtheme if you change theme files. Can you please take care that the slideshow images are still shareable on facebook (like the slideshow that is in use now). Before we work on the live-site please make all changes at: [login to view URL] After you have successfully completed the job I will transfer everything to the live-site As a testbanner please use [login to view URL] (600x90px) or any other image you like in similar dimensions.