The assembly stage will be separated into two: first, the creation of the parts, then, assembling the parts.
In the first stage, you will receive outputs for all your resources/parts needed, and your factory grid will turn dark blue with some grids bearing symbols. A small book called "Blueprint Manual" will fall beside you. This book will show you what each symbol means, so you will build a factory however you want, freely, and the necessary conditions are that you need to create a certain number of parts to finish the factory. At the beginning of the phase, each resource input will have a predefined color, and you need to fit the items on the tiles with the correct color.
You must fit your resources/parts into the indicated symbols, but each symbol will contain a rule, “you need to attach a piece on the MIDDLE before you attach on the borders” or “this piece needs to be attached on a high temperature”. Each time you fit a part, it will give feedback that it has fit. When all parts are fitted, they will "melt holographically" and give positive feedback, updating your progress status. When you build all the necessary parts within the cycle, the factory closes, and all the created parts fall from a hole in the ceiling beside you, leading you to the second stage.
Here I’ll explain each Blueprint’s Tile
This is the Standard Tile, you need to place the item of the correct color on top of it
This is the Double Tile, meaning that you need to put two items on it
This is the priority tile, first, you must place the corresponding item on the tile with the orange symbol. This will activate the surrounding tiles, and you can then place items on top of them. If you place an item on top of the deactivated tiles around it, they will be repelled.
Lets get an example:
Here we have 3 entrances, each with its own colors and corresponding tiles
Notice that in the tile above, after the chip is placed on the yellow tile, the surrounding red tiles become activated, allowing a metal plate to be placed on them.
With all the tiles in their designated places, they will begin to melt and generate the pieces (as soon as a set of pieces is complete, it will begin to disappear, you don’t need to have EVERY tile filled to create the pieces, here I placed them all at once for presentation purposes only).