Adding some mods like:

• AMENDMENTS - adding some not-minecrafty block features
• CREATE & CREATE DECO - build some mechanisms using create instead of redstone
• DECORATIVE BLOCKS - adding some decorations to also decorate interior
• HANDCRAFTED - adding more furniture to make your building a home
• CHIPPED - adding many variates of vanilla blocks
• IMMERSIVE PAINTINGS - adding more paintings or images uploaded from pc
• IRON CHESTS - classic chests have small storage, but what about the iron ones?
• ITEMS DISPLAYED - place items on ground like blocks
• MACAW'S SERIES - adding furniture, doors, fences and other decorative stuff
• MIGHTY MAIL - send envelopes and some packed stuff to other players
• PLUSHIE MOD - adding wool animals that you can place
• SUPPLEMENTARIES - adding more functional blocks like wall clock or globe
• TREE HARVESTER - if building in default world, you can easily cut trees

I hope your giant building contraption will succeed!