To simplify assembly (connecting parts of a mod into one), you can spawn all objects without moving the cursor in one place. I deliberately did not center the parts of the mod relative to the origin to make it easier to connect them together.

Before creating all parts of the mod, I strongly not recommend changing the values of their coordinates X, Y, Z and changing the angles of rotation. After installation, you can change these values by adding or subtracting your value to the original value when spawning, and simultaneously in all parts.

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Full level Installation Instruction

[drive.google.com]