Starting July 30th, you will no longer be able to log in to a Curse account that was not merged with a Twitch account. If you have not yet merged your Curse account with a Twitch account, please do so here! Otherwise, your account and its content will be inaccessible.
Seems like a good idea to me. You could have the ocean floor made of just cobblestone (But with caves and stuff). The player could start out in a glass house. In order to substitute for wood, stone sticks and stone crafting tables could be added.