Sideways scrolling

I’m only in the early stages of creating my website.

Need the portfolio page examples to sideways scroll, as I have far more projects than 6.

And when the user clicks on one of the links I would like the page that opens up and hovers to be able to scroll to the side. I’ve designed a mock up of the type of look I’m going for on the pop up. It’s a portrait page which would all appear on a desktop or tablet(horizontal) or the user would have to scroll to the right side.. for each project there would possibly be upto 4 of these landscape pages, which would load as you scroll to the right. I’d need also some kind of indicator flashing arrow as I’ve seen on other sites. I can upload the page from the indesign document for you to view, but would need advice on whether I recreate this type of layout in generate press pop up (and if so how?) or whether I create a pdf or similar, and whether this would effect the seo?

Thanks
Daryl