Updated to 1.12!
Great Idea!
In Hoenn, where there are places for Secret Bases, we will have item frames for where they are located. Right click on them with a music disc, or "Secret Power," will take you to the the base "vault" designated by which item is in the item frames.Leaf Block: Tps to Alpha Base VaultSmooth Sandstone: Tps to Espilion VaultNetherrack: Tps to Iota VaultDirt: Tps to Nu VaultStone: Tps to Rho VaultTall Grass Block: Tps to Phi VaultReference: http://bulbapedia.bulbagarden.net/wiki/Secret_base
If I know Java right, this is mostly IF THIS HAPPENS THEN THIS HAPPENS.