Kestari grow their space faring craft from genetically modified seeds. The Kestari have to specifically engineer each seed to grow into a specific ship, however some seeds will never sprout, some will die while they grow, and some will have defects that will cause them to be unusable. This is mostly due to the quality of the seed, and how it was made. Prestigious companies that produce the best seeds with the highest success rate and makes the most consistent product. However there are those smaller companies and factions that make cheaper seeds yet are of a reduced quality.