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This sounds very much like Rusty's Space Ship By Evelyn Shipley Lampman, 1957.

Two children, Rusty and Susan, build a play spaceship, which becomes a real spaceship when they get involved with a lizard like alien who visited Earth and now wants to return to his home planet Eopee.

It is mentioned in various previous answers:

• Kids' book about boys finding a disc from a planet called "Eyopee"

• 60's book about a boy who builds a spaceship from cardboard in garage

• Children's novel: three children (plus dog?) travel to the Moon in pretend spaceship turned real

This sounds very much like Rusty's Space Ship By Evelyn Shipley Lampman, 1957.

Two children, Rusty and Susan, build a play spaceship, which becomes a real spaceship when they get involved with a lizard like alien who visited Earth and now wants to return to his home planet Eopee.

It is mentioned in various previous answers:

• Kids' book about boys finding a disc from a planet called "Eyopee"

• 60's book about a boy who builds a spaceship from cardboard in garage

• Children's novel: three children (plus dog?) travel to the Moon in pretend spaceship turned real

My answer to this question about navigation in space wonders whether the alien in Rusty's Space Ship ever found his home:

https://worldbuilding.stackexchange.com/questions/180161/finding-earth-on-a-star-map/180214#180214[1]

This sounds very much like Rusty's Space Ship By Evelyn Shipley Lampman, 1957.

Two children, Rusty and Susan, build a play spaceship, which becomes a real spaceship when they get involved with a lizard like alien who visited Earth and now wants to return to his home planet Eopee.

It is mentioned in various previous answers:

https://scifi.stackexchange.com/questions/202126/kids-book-about-boys-finding-a-disc-from-a-planet-called-eyopee/202129#202129[1]

https://scifi.stackexchange.com/questions/214382/60s-book-about-a-boy-who-builds-a-spaceship-from-cardboard-in-garage/214384#214384[2]

https://scifi.stackexchange.com/questions/66578/childrens-novel-three-children-plus-dog-travel-to-the-moon-in-pretend-space/145518#145518[3]

In my answer to a question about navigation in interstellar space:

https://worldbuilding.stackexchange.com/questions/180161/finding-earth-on-a-star-map/180214#180214[4]

I expressed doubt that the alien ever managed to find his way home unless he managed to remember the right directions. Searching randomly for his home would be an an endless task.

This sounds very much like Rusty's Space Ship By Evelyn Shipley Lampman, 1957.

Two children, Rusty and Susan, build a play spaceship, which becomes a real spaceship when they get involved with a lizard like alien who visited Earth and now wants to return to his home planet Eopee.

It is mentioned in various previous answers:

• Kids' book about boys finding a disc from a planet called "Eyopee"

• 60's book about a boy who builds a spaceship from cardboard in garage

• Children's novel: three children (plus dog?) travel to the Moon in pretend spaceship turned real

This sounds very much like Rusty's Space Ship By Evelyn Shipley Lampman, 1957.

Two children, Rusty and Susan, build a play spaceship, which becomes a real spaceship when they get involved with a lizard like alien who visited Earth and now wants to return to his home planet Eopee.

It is mentioned in various previous answers:

https://scifi.stackexchange.com/questions/202126/kids-book-about-boys-finding-a-disc-from-a-planet-called-eyopee/202129#202129[1]

https://scifi.stackexchange.com/questions/214382/60s-book-about-a-boy-who-builds-a-spaceship-from-cardboard-in-garage/214384#214384[2]

https://scifi.stackexchange.com/questions/66578/childrens-novel-three-children-plus-dog-travel-to-the-moon-in-pretend-space/145518#145518[3]

This sounds very much like Rusty's Space Ship By Evelyn Shipley Lampman, 1957.

Two children, Rusty and Susan, build a play spaceship, which becomes a real spaceship when they get involved with a lizard like alien who visited Earth and now wants to return to his home planet Eopee.

It is mentioned in various previous answers:

https://scifi.stackexchange.com/questions/202126/kids-book-about-boys-finding-a-disc-from-a-planet-called-eyopee/202129#202129[1]

https://scifi.stackexchange.com/questions/214382/60s-book-about-a-boy-who-builds-a-spaceship-from-cardboard-in-garage/214384#214384[2]

https://scifi.stackexchange.com/questions/66578/childrens-novel-three-children-plus-dog-travel-to-the-moon-in-pretend-space/145518#145518[3]

In my answer to a question about navigation in interstellar space:

https://worldbuilding.stackexchange.com/questions/180161/finding-earth-on-a-star-map/180214#180214[4]

I expressed doubt that the alien ever managed to find his way home unless he managed to remember the right directions. Searching randomly for his home would be an an endless task.