It is called prison. A work themed prison. I think it would be nice where you can rent cells. You can like store things in it. Basically I am asking a way to store more item with a cost.
Why would you pay to put stuff in prison? You get put there if you're naughty. You have to buy your way out.
It was way harder when there were no nether warts, and donor ranks. We had to mine to get to Legend D;
Claim the ground. Build a small obby base around it. best you can do really. Try to make the obbby base atleast 2 layers thick.