When I planned this layout, I imagined 4 identical modules that could be connected either end to end, or each module forming one side of a 4-sided loop, or a combination of the two, which is what you see in the video: the two completed modules are end to end in the front, and the track then loops around to the back and runs on the two unfinished modules which are also end to end. I really don't have the room to set it up permanently, but this way I can enjoy the big trains and store it in pieces when I'm done.
When you design your diorama, you can make the track run off at each end for future connection to other modules. That encourages you to think about what the next module will look like, but there's no rush, and you still have something to show for your efforts. 😁
