There are four main blog posts for this layout going over the entire construction process.
Part 1 Benchwork: https://www.steves-trains.com/post/building-a-3-5-x-5-5-n-scale-layout-part-1-benchwork-and-base-scenery
Part 2 Track and Wiring: https://www.steves-trains.com/post/building-a-3-5-x-5-5-n-scale-layout-part-2-track-and-wiring
Part 3 Scenery and Structures: https://www.steves-trains.com/post/building-a-3-5-x-5-5-n-scale-layout-part-3-more-scenery-structures-signals-and-lighting
Part 4 Final Scenery and Details: https://www.steves-trains.com/post/building-a-3-5-x-5-5-n-scale-layout-part-4-adding-trees-water-features-and-final-details
I put together a compilation video of the 3x5 N scale layout. This video combines the series into one video, with the beginnings and ends of the videos, recaps, etc. stripped out to make it a shorter view time.
There isn't any new content in this compilation video, but these big compilation videos do better on YouTube with non-subscribers in terms of total views. Plus, if you want to rewatch the series, it puts it all in one video.