Grid Snapping, sigh, the 1st time I read that I was hopping for a grid overlay across the whole settlement to make things neater.
For 99% of my builds, I am not so worried about things snapping together exactly. Reason being, IRL things shift and settle over time. Place anywhere is just amazing with what you can do with it. I learned how to do a lot of this stuff from building model railroad scenery. Here's an example... bear with me.
So this is a walkway that I built at Abernathy. The terrain goes up and down, and you can see how each slab isn't perfectly lined up. ALL of it was done using PA. One fairly critical thing I found out is that the slabs cannot be stacked a full height. Reason? When you walk down the path, you can get stuck at the edge of a slab because the height is too great. Going down is never a problem.
Here you can see how the land form goes up and down. Right in the center where the three fence posts are, the path sort of buried itself into the ground, and didn't really look all that smooth. So.... I tore that out and made a gentle curve with the slabs using PA. I was also testing out the walkway for those uphill pathing problems I mentioned before. So I had to reposition most of the slabs for height. The rocks and some of the plant cover were added to cover holes underneath the walkway.
Here's the area rebuilt. That big rock is actually 4 pieces that were stacked and positioned using PA. It adds some visual interest, and it looks like the path was built on top and over the outcrop. Super common here in New England.
And this is the bottom end where the path curves towards the main house. You can see the holes underneath the walkways. They will be covered by groundcovers... I like using Creative Gardens for that.
I added a few trees as viewblocks. More would be added on both sides of the path. But I like having lighted paths so I can see where in the hell I am going if possible.
So I added these Japanese lanterns from Awarhero's Japanese decor mod. They require no power.... perfect for items like this. I also built a picket fence line along the path. Again, PA saved the day. The fences are not continuous, there are places where you can see old fencing and newer parts. Typical New England. I got the idea for the fence from the Minuteman National Park. There are parts of the original 'Battle Road' that go through private property, and this is just one of the methods they used to mark the paths and make it fit into the overall scenery.
Hope this helped some, and gave you some ideas of your own