allowCommands = true (you can change your game type to creative if you are having issues surviving drops)
commandBlockOutput = false
doMobSpawning = false (you can play on ANY difficulty you like)
keepInventory = true (your potions will stay with you when you die)
mobGriefing = false (just in case!)

Replaced minecart elevators and nether portals with teleportation command blocks

Added potion machines at the top of each drop

Added spawn point reset at the top of each drop