As for the implementation, it is not very difficult stuff; I divide up the world into chunks(just like in Minecraft), and as the camera traverses the world, the chunks that become out of range are thrown away and are no longer rendered. And in the far away horizon I keep adding new chunks, to give the illusion that the world is infinite.
So it is not very complicated stuff; the source code is only ~450LOC, which can be found here: https://github.com/Erkaman/wireframe-world/blob/gh-pages/wir.... It is relatively well-commented, so it should be easy to understand, I hope.