I built this over the course of several days, and I am very satisfied with the result.
First, we have a general overview of what I built.
The entrance is protected by a very simple little code mechanism. Click the four bricks to change their color to either black or red; the right combination opens the door.
Down a short hallway is a cozy little area with some kitchen and living room stuff.
Bunk beds that can be slept in. Unfortunately, due to glitchiness with crouch-sitting, when you do so, your perspective goes above the ceiling. Oh well.
Here's the water elevator and a few windows that peek out of the terrain.
The hallway to the challenge, and a little evented opinions thing. I clicked the dislike button a few times just to check its functionality. It is, unfortunately, spammable, and there is no way to make it not work for the same person twice on the block party.
A little hole in the wall that has a treasure brick in it. The treasure brick acts like a miniature sun, which is why there's grass growing there. I don't know why I did that, I just liked the idea.
The challenge area. I won't reveal what's within it, because that would make it a lot less interesting. The challenge is quite fast once you know how to do it. I've done it all the way through three or four times.
Poetry turtle. Most boss thing since Lord Vader.
There are a few hidden treasure bricks around the build. You'll find them if you look hard enough, but not otherwise. One of them is nearly, and don't misquote me, NEARLY impossible to get without jetting, but I managed it. Sounds kinda pathetic, but it really isn't.
Please rate on a scale of one to ten, and nothing stupid like "OVER NEIN FOUNTAIN!!!!!!" or whatever it is that you young people say these days. Also, if you would complete the challenge or try out the poetry turtle (with an exclusive, original poem) or rate the build with it's built-in rating system, I would greatly appreciate it.