I found a way how to make a Portal to Nether any size than a normal one. You can make a really small portal, which is one block, good for a purple window, like how I used it to be. You can also make a huge one like this schematic. If you use the Portal, the portal you come from, in the Nether, will be a normal sized portal and when you go back you would probably not respond back at that same portal you came from. So pretty much the portal will just be for show. I can't make a video to show you how, but I will tell you how if I could get 10 downloads.