Nice job again, Adam. These Danni HotBox sets are really nice, and I like the vivid colour tone.
One thing, though. Why 4800px specifically? Unless you're viewing portions of the photos at full resolution (where you'll start to notice AI artifacts), or you actually have a 4800px resolution display, your graphics card will be shrinking the photos to the screen size and introducing blurring effects. You might be better choosing a specific standard resolution (e.g. 4K = 3840x2160), so you could go for 3840px resolution so that the photo isn't resized in full-screen display on a 4K display. That also gives you a saving in disk space.
MMMMh... Good question ! In fact I have an iMac with a 5K retina 27' screen (5120 x 2880) and I don't matter about resolution display. Upscaling to 4800px was a common limit to harmonize all sets when you begin with 800px 960px, 1200px or 1600px (x6, x5, x4 or x3). And I didn't want to up more than 5000px because image's weight increases too much.
At 4800px and 72dpi, images are between 1,6 and 2Mo. That's correct.
I also discovered I could have exactly the same quality upscaling at 4800px than 3200px. So I chose to upscale as high as possible in a decent image weight
