I've always wanted to make Portal 2 in blockland, but I always faced the problem that there are massive moving rooms, and it is quite hard to simulate that, without having stuff loads of named bricks, or like... Elevators and stuff, and the other thing that got in my way, was that the BL Portal gun didn't work on slants.
On Subject: This build is pretty nice. 9/10
Last picture looks a little odd