The hatchery is the zerg’s starting building and resource collection center. It can spawn queens and larva and can be upgraded to a lair and then a hive to unlock new units.
The model is folded from a pentagon of which construction I derived myself. Methods I found online did not give me the accuracy I desired so I created my own method. The construction starts from a square and uses triangle properties to approximate the necessary angles. Because the pentagon is derived from a square, this model could technically abide by pure origami rules but I cut off the excess paper as leaving it would have made it difficult to fold and left the model looking lopsided.
The design itself went through only a couple of iterations. The biggest change was making the central five spikes smaller which allowed the outer five to be bigger.
During the final folding process with colored paper, I don’t often make mistakes but after an hour of pre-creasing, I realized I had folded the central five spikes on an incorrect orientation; they would have lined up with the outer five spikes instead of being in between them. Typically I would have started from a new piece of paper but creating a pentagon is a pain in itself so I just continued with the original paper.
Folded from a single pentagonal piece of paper.
Reference from StarCraft Wiki
I’ll post diagrams for the pentagon construction later.
Li'l Midget's Origami Blog 