A puzzle plane held together by magnets!
Magnets can potentially become loose and since they are small they can be a hazard to young kids. Therefore this design is not suitable for 0-3 year olds. https://www.org/English/safety-prevention/at-home/Pages/Dangers-of-Magnetic-Toys-and-Fake-Piercings.aspx
The only thing that you will need other than plastic are the magnets (3mm tall, 6mm diameter). There are 63 magnet sockets in total but I used probably 55 magnets.
Dimensions (L x W x H): 217mn x 255mm x 116mm
Cut up for minimal support requirement. I glued the magnets in the pockets with CA clue and it worked quite well, but care need so be taken because any leaks can glue the plastic parts together.
Should you need higher quality STLs or the source STEP file, considering purchasing those here https://www.myminifactory.com/object/3d-print-135298
Magnet glueing tips: https://www.kjmagnetics.com/blog.asp?p=sticky-business-how-to-glue-neodymum-magnets