There is so much space where Dragon Challenge is. Just in case you don't believe me, have a look. This is the exact size in both relations. You could fit diagonal alley into that space. That includes tons of shops, a coaster and the train station. Could easily fit a resturaunt, an indoor launch coaster, and more than likely an interactive dark ride with the same building size as Transformers. I would rather have Dark Forest than two rough B&M inverted. This might even be a little larger when I photoshopped it onto Dragon Challenge area View attachment 3493
What would be built. I feel like a lot of construction should go to the castle and hogsmeade itself. The castle looks way too small up close. Also space is very small btw the castle and hippo. You can just replace am indoor coaster w all that space. That's just the size of even smaller than Gringotts.