Take 2 of your big squares.

Put some hot glue on one thin side of a square and position the side of the other square on it, creating a right angle.

You have to create a cube and your big squares are the sides of it, so glue another square to the second one just like you did with the first 2, always creating a right angle.

Add the fourth square gluing one side to the first square and the opposite side to the third square.



I know this probably sounds like a mess but look at the pictures, it should be clearer that way! :)



Now you have 4 sides so glue another square to the top to "close" the cube.

The bottom is still free but we will need that space for the lightbulb.



Put all this aside for a while now.