Everything fits together really nicely for the 216. Wouldn't be surprised if a sneaky 2x4 more is in there somewhere, but it feels good.
Edit: Looks like we were missing something
Edit 2: The 200 is great. Cool new idea and much more satisfying than my 208
It is always hard for me to find new ideas on a level like this. Even after I finally found something I thought I could use, it took me a couple of hours to implement it into somewhere useful.
I could see people stumbling into it a lot quicker than me, but I think most will be led into the very tempting false branches