This page in our guide to Layers of Fear 2 contains the solution to the rocket puzzle which appears in act 3. This puzzle requires you to construct and launch a rocket. Thanks to that, you will have a "space journey".
You have to solve this puzzle after reaching the office.
Find the incomplete rocket. You need to complete its construction. You need to find the three missing metal elements of the rocket. The first fragment is next of the rocket.
The other two metal elements are in other parts of the office.
Go back with each metal fragment to the rocket to install it (example in the picture).
Installing metal components is not all, because you still need to take care of the power delivery. Find the power cable and drag it to the electric socket.
Press the button on the wall to launch the rocket.
You can already approach the rocket's viewfinder and interact with it so you can complete the puzzle and begin your "space journey".