New progress update! As you can see below I have completed 1st floor & roof. I made 2 other big rooms on either side of this area. On the left side is a potion brewing station that allows me to easily brew new potions and on the right is a complex 11 furnace station with hoppers & rail carts. I'll need to take pictures.
As you can see from the roof, I raided an ocean monument! I luckily found FOUR sponge rooms too! Which really came in handy since I now cleared it all out. Also wiped out all the floors and walls so that it's just a big empty structure now. I really need a lot of fish drops to make more sea lanterns. No Observer block yet, so I can't make a flying machine to clear out the water above ocean. But I'll prob make something simple and drop sand and clear out a small area above and set up some drops.