Customizing a slideshow with description available in Lightbox view

Site URL: https://turkey-chiton-rmpc.squarespace.com/weddings

Hello! I'm having a hard time formatting a slideshow on my 'weddings' page (link attached in the next paragraph).

I want to have the proportions of the slideshow to be the same as the one on our homepage (see attached photo #1), but with photo thumbnail previews; you'll see that currently, the slideshow on the "weddings" page is very small and theres weird spacing between the thumbnails and slideshow because I have descriptions. Is there a way I could manually adjust this? Additionally, my client wants visitors to be able to click on an image they like and see it expanded in a lightbox (see attached photo #2) with more details about it. However, it's important that no descriptions are visible until a visitor actually clicks on an image. 

• 'Weddings' page: https://turkey-chiton-rmpc.squarespace.com/weddings
• Password: chivers

Thank you so much for your time in advance.

@yoannam this is exactly what I am working on, so far only Grid gallery supports Lightbox, I am working on support it on Slideshow, Stacked and Carousel Gallery too!

https://beyondspace-staging.squarespace.com/?password=1234&noredirect