1. Build it in a creative world using Java 1.12.2 or below (you may have to use "stand-in" blocks for things that don't exist until later versions). Use WorldEdit to make things easier/quicker.
2. Use Schematica or MCEdit to analyse the structure, they will both give you an itemized list of all blocks used. Schematica will generate a 3D, ghost-like "Blueprint" in your world (1.12 or below) that helps you build the structure exactly as before. The function of this ghostly blueprint structure can be selected between a few options.
i usually count and multiply layers and add them up.
for example if i were to build a 100x100 wall that is 2 stone blocks thick, with 2 more layers of cobblestone on the outer and inner side, and make it 5 blocks high then id be like
100 blocks long x 2 blocks thick x5 blocks high x 4 walls to make a square = around 4000 stone bricks or around 62 stacks, or around 1x double chest +8 stacks.
With such larger buildings and structures i dont actually need a precise number, just approximate so that i can mine the stone in peace till i fill up my double chests and then i can focus only on building
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I don't like giving too much info about the seeds i share. I feel like its better to let others explore and find out the chest contents,dungeon places and biomes. If someone is giving me a gift i would rather not know what it is until i open it for my self.