There's Potential!
This looks like it has some awesome potential, but content can still be improved.
The rebuilding process was excruciatingly difficult.. I'm sure others will agree. I looked at your hint in the description, tried placing the pieces in multiple places, and could get nothing out of it. I had to refresh the page a few times and start over in order to get it to work every once in a while.
What you have here is good, but can be made great. Making objects lock into place/etc, EVEN if the rebuilding is supposed to be difficult, will greatly improve gameplay.