This is the fun part and also the part that requires most patience and dexterous hands, but using the recommendations in this La Folia Project the results can be easily attained.
The woofer conductor design must fulfill the general layout as shown in the diagrams.
This explains also shows you how and why the speaker actually works. See how the conductors between each magnet polarity have the current flowing in the same direction?
You then use the general three finger rule and figure out the force exerted on the membrane, change the polarity and the force is 180 degrees shifted, thus the speaker membrane will move in and out as the current changes flow, as would be expected…
More on that at a later moment…