I want it to be like a big tilemap. Imagine it like a tunnel. As an example, I would make a horizontal tunnel piece, a vertical tunnel piece, and a tunnel intersection piece. All of these pieces would be big enough for the player to move around in. I could then drag these pieces together into a level layout and make the level that way. I got this idea from the making of Oblivion video: https://youtu.be/zvm0CN3tQFI?t=7m. In this clip the level designer drags pieces together like a Lego set and makes a whole dungeon out of it. If i could do something similar to that it would speed up the design of the game by a lot.