The blueprint KIKI found belonged to some kind of military mecha's ejectable flying blade. This type of weapon isn't highly practical in the interstellar army, unlike the chain sword, so it was an obsolete version from long ago. It's still unclear how she found it.
However, Lin Xian understood KIKI's intention. This kind of flying blade doesn't require precise ultra-high-voltage electric blade design; it's purely used by her for telekinesis control as a weapon. So he only needed to consider the materials and dimensions based on this shape to suit KIKI's use.
After thinking, Lin Xian decided to use tungsten-titanium alloy. This metal is the material for crafting electric knives, not less in hardness, and not exactly light in weight. The kinetic damage caused by telekinesis strangling would also be considerable.