The first Capsule Corporation spaceship was made for Goku by Dr. Brief out of the scraps of Goku's original spaceship that brought him to Earth. Brief made the spaceship with a bedroom, a bathroom, and a training room that included an intense gravity simulation machine that goes up to 100x Earth's gravity. Goku used the spaceship to travel to Planet Namek while training using the Gravity Machine over the next five days, slowly increasing the gravity from 10x to 20x to 50x to 100x. After four days of training, Goku relaxed and rested himself on the fifth day, arriving just time to save Gohan, Krillin, and Vegeta from the Ginyu Force. After transforming into a Super Saiyan for the first time, Goku told Gohan to take Piccolo and Bulma to the spaceship that he used to get here (although Gohan, Piccolo, Bulma were later teleported from Namek to Earth thanks to Porunga). After Goku's long fight with Frieza, Goku didn't have enough time to make to his spaceship so he had to use Frieza's spaceship, which had been damaged by Vegeta a few days earlier. The first Capsule Corporation spaceship was destroyed during Planet Namek's destruction.
Design : Guruh Memory
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