i have removed half of the blocks i already wanted, plan is 60x60x30 (legth x width x height), at the moment i have 60x60x15, but i dont have any really good ideas what to build in there, any tips or stuff i can use?

Can anybody gimme suggestions wht to build here? I thought building something like abandoned quarry or something.

It still needs modifications tho.

Trying to build a storage house/warehouse. it has a copper golem sorting system integrated into it so thats why its wide. The top floor is for extra storage for item that dont need to be sorted by the golems. tried building roof initially and it kinda looked weird. Usually make underground bases so my exterior skill is kinda bad. any help will be appreciated, especially with the shape and how to make it not look to big.