Each spaceship has 7 crafting times. Crafting requires 2 spaceships of the same type and a number of tokens. If you want to craft more than 7 times, the token consumed will increase a lot more. The crafting time is 7 days.
After every research, crafting price will go up, success rate for upgrading class and grade will also increase.
Percentage chance of spaceship upgrading to the next class, components inheriting parent characteristics and upgrading to higher grade are as follow:
Inheritance: 75% from parents or keep the same class
Mutated inheritance Type 1: 20% components inheriting from parents' class will be upgraded to next grade
Mutated inheritance Type 2: 5% components inheriting from parents' class will be upgraded two grades.