Story idea

After considering the way children learn through play and what each type of play can help the child learn towards, I have started thinking about a story. I want a story where the child could hopefully learn something from while still being engaged and excited to read/look at the illustrations.

I want the book to be mostly the illustrations with few words although still a significant amount of words to describe the story well enough for the child to understand.

While putting the story together, I have considered the wide imagination a young child has, so imagination is a key/big part to my story.

I also want to aim my book towards 3-5 year olds, pre schoolers.

(I may come back to this post and update it, as I continue to tweak and alter the story but will leave the date in the updated bit, to keep track of my progress).

Initial Story Idea
(I'm going to list the story in bullet points to make it clear what is going on, to begin with, then eventually I will write it out properly ready to be put in the book).

• Main character (A boy but perhaps dressed in gender neutral clothing, like a onsie to still seem appealing to girls) doing a jigsaw but cannot find the last piece. 
• (This is where his imagination starts....)
• First he has a look on the pirate ship (his bunk bed), climbing the rigging etc(ladder on bunk bed) 
• Then meets a pirate and has to help him with something.
• Still no jigsaw piece...
• Goes to the jungle, meets a monkey (his stuffed toy monkey lying on his floor) and again helps this monkey with a problem.
• Still no jigsaw piece...
• Climbs a massive tree house(book shelf) meets a squirrel, helps him with something.
• Still no jigsaw piece....
• Takes part in a car race(spiny chair) helps a fellow racer.
• Still no jigsaw piece....
• Goes to space(star stickers on ceiling), helps a spaceman.
• Still no jigsaw piece...
• Last few illustrations are the boy back in his room, with each place he has been (objects) being obvious to the viewer (monkey toy on floor, pirate flags across bed, stars stickers on ceiling, racing stripes on chair etc) looking defeated because he cannot find his jigsaw piece to finish his jigsaw.
• Ends up finding it in an obvious place, like under the pillow/under the bed - 'There was one play he didn't look' etc then it is there...