I think this could be a VERY amazing map to do for survival. It could be the biggest cave since 404? There are several dungeons in there, bunch of diamonds and i think it'd be an amazing adventure to play! Maybe even with friends?
Just get in there and try to stay alive as well as you can. You have as long as you want to prepare to go inside. But when you go inside, your'e not allowed to mine stone for the challenge (unless you need to get past an obstacle). So get as much stone as you can (for furnaces, steps, building etc.). Diamonds are your score!