I used this video to get the shape of the Arena: https://www.youtube.com/watch?v=MuLfJtjMrWo
But I made mine out of blocks with better blast resistance. Jack o'Lanterns have the same blast resistance as Pumpkins, which is slightly higher than that of Redstone Lamps and Glowstone for some reason. Granted, it's not as high as that of stone blocks. I also used Bedrock for every block that takes up a full cube, did not use the checkerboard pattern of Birch Wood Planks and Nether Bricks on the floor, tried to use Stone Brick Slabs and Stone Brick Stairs, and filled in some details that the original video missed.
I tried to use blocks that would work with Minecraft versions earlier than the one I built it in.
Feel free to use this Arena for personal use.
