The system you play can also have a very big effect terrain wise & the type of terrain you'll need will be determined by the setting you choose to play in, a WWII game will more often then not will be played out over open spaces with fields, some wood' & maybe a small village this I think would certainly be true for the likes of FoW.
Tables for gaming on come in two forms modular or flat where you put the terrain down on top of them, now they both have their advantages a modular table will be done in such a way that everything blends in together & if done right will look a million dollars but will grow stale after awhile as your always fighting in that same place plus unless you have a big space for storage modular tables are really a non runner.
So the other type we have is the flat table where we put terrain on to it.
Now I'm not going to go into the type of terrain that most games of 40K take place in, but one of the things that a lot of 40K players dream of doing is fighting a boarding action on a spaceship or fighting inside some kind of industrial complex.
So the type of terrain we need for this is made up of large areas & corridors, now if we do this like the modular table after a few games it will feel stale, we could make up some rooms & corridors that are interchangeable but can be a lot of stuff to store.
There is however another way to do this which I'm going to explore in this post, now the stuff I'll be using to form the rooms & corridors is not painted as I was jut trying this out to see how it would work so it's like a bit of a live post in that regard.
So we'll start with cutting our walls.
Now you can add some detail to the walls if you wish it would improve the look of things but it's more work.
When doing this keep the pieces bach about 3/4 of an inch from the ends so that when one wall is butting up to another that the plastic pieces won't end up on top of one another.
Then using the same wall pieces -1 I made a completely different lay out.
This system also has another big advantage over the other two you talked about earlier in the post & that's storage.