Ok so i really want to be able to get ride of the annoying gaps you get when placing junk walls i mean you can just about walk through them and they don't really stop raiders if they would snap together like the floors pices do that would be so much better and if we could sink then in to the ground a little bit so on hills you don't get large gaps under them as well

If your console. Try holding, L1 and X to lower them.

yeah i tried that and they don't go down as far as i want i still get mad gaps under them on hills but that dose help with other things i'm doing as well thank you. It's a pain playing on PS4 my pc is to old to play this game otherwise i wouldn't care as i could get mods for it but i have to wait till they sort out the mods for the consoles or save for a new pc haha

You can place the junk walls on carpets, then manipulate the carpet instead of the wall piece. If you did it right, the wall will move WITH the carpet. The game will only worry about the carpet's hit box, ignoring the wall's, allowing the wall to clip into/through other things.

This is also an excellent technique for placing turrets and furniture when the game says "NO".

For gaps at the bottom of junk fences, I often use the above trick to stuff furniture into the gap, like couches or tables. Junk walls are cobbled together out of random &%$# anyway, so it looks fine.

I can confirm that carpets work.

Sometimes raiders spawn inside the settlement so walls are mostly just for decoration anyway.

Concrete walls are superior anyway......most people seem to abandon the junk walls fairly early once they realise that they can use wooden and metal housing walls or shack foundations (Concrete walls) if you want to build walls. The concrete option also allows you to build a wall and top that with the buildings the settlement needs.

I find that the gaps are primarily when you try to butt two junk wall panels together on uneven ground. I also find that if you alternate junk wall panels with a regular wall panel, you can get a tighter fit. This also has the advantage that it becomes possible to have slight changes of angle, making it easier to have a gradual change of direction rather than a sharp 90-degree turn. [In particular, I'm not forced to use those crappy corner pieces that we got. Both the junk wall corner and the wall corner pieces look like (fecal matter) and have glaring gaps that a person could wiggle through, if the program allowed for squirming through tight places.]

I much prefer the junk walls. They look the most "wastelandy" and I find the the concrete ones (these are the floor-panels raised up. Right?) unbelievable.