I recently started it and for now I have made some fast progress (I think). The surface and cave parts of the map are finished (but I might make some tweaks in the future). Here is a video that shows the parts and some more info on the map:
Currently I'm working on the Nether part. The first challenge requires jumping! I'll try not to show much stuff, so I can avoid showing spoilers before the release.
From the video you will learn that I don't have a really clear idea how to make the whole thing. But you can give me ideas in the comment section. I'll appreciate that and maybe I'll add it in the map!
Yes, the progress of the map has been going pretty fast and pretty satisfying. The first Nether part will take a while because of trigger_once-es* made by using redstone. Yeah, redstone stuff is impressing, but can prove pretty complicated to make- most of the time you wander how to make the "machine" as compact as possible and with no errors.
Currently I'm working on an area, where the player will have to sprint for his life, while traps activate from above and below. It's really entertaining for me to test the area. It's like the whole building is collapsing. There is a just one of the traps in WIP state (damn thous pig-men):
I'm really itching to show a video of the area, but I said in the description of the map why I don't want to do so.
*trigger_once: In Half Life (and maybe Half Life 2) there is a non-solid, transparent and invisible block entity that when entered by the player, it activates something only once. If the player enters it a second time, nothing happens. In Minecraft it's a bit hard to make the same thing using pressure plates, because something must get activated from the plates that starts to power the redstone (I hope you understood that last part...).