Nice dynamic view of a passing mecha.
Story - an alien race, trillions of light years away sent a data signal containing the complete plans of this mecha. They built it and are finding out what it can do.
Story 2 - Tokoyama the local blacksmith known as a recluse is commonly known to be lazy. Word around town is that he is worse than lazy. Strangely no-one sees him that frequently. But on this particular day, opinions are changed when he takes his latest project out for a test flight.
Story 3 - A foreign welfare organisation send parts to various orphanages. The teens love the puzzle of putting objects together. After a couple of years they have assembled hundreds of individual parts. Finally they are sent plans on how to join the pieces together. Imagine the surprise when they realize that all the while they had been constructing a WMD.