I build this a long time ago because I didn't have a nether fortress. I made space for a big castle (bowser style) and even made big horn pillars but then once Donkey Kong was on the wall I decided to try something different. It is level 1 and 2 from the original game.

I was midway thru rebuilding a minecart system and had looked at cart stacking/multi track systems on YT and the sensors my friend has a chicken disco :D It takes a few goes but is fun to play, I added half slabs off the board so you can jump out and look up to see the carts,

Enjoy ;)

Additional Notes

The pictures are more recent than the video (lava/water) I don't have it constantly running