There is some information to back up the contention that the force is involved in making a lightsaber though. In the TCW episode "The Gathering" the padawans have to harvest their crystal. Yoda describes it as the heart of the saber, and that it focuses the force from the Jedi.
In "A Test Of Strength" the wookiee concentrates to receive the image of his saber. The droid gives them advice on how to focus their thoughts, based on his experience of working with hundreds of other Jedi, but their designs come 'from within'.
Later they follow some basic schematics, but Ahsoka tells them to trust in the force for the design to become clear.
Yes the droid assembles a saber, but it only seems to be the shell, and it's not shown working.
So knasserll and progressions are both right. There are mystical aspects, there are mechanical aspects, therefore pick which you want to run with in your galaxy and make it so. (Oops - crossing the streams there).