One idea could be to get him a unique and challenging model building kit that he hasn't tried before, such as a 3D puzzle of a car or plane. Another idea could be to get him a book or magazine on model building, with tips and tricks that he can use in his hobby. Additionally, you could get him a gift card to a local hobby store, so he can pick out exactly what he wants or needs for his current project. If you want to go for a sentimental gift, you could also consider getting a personalized model or figurine of something that holds special meaning to him, such as a replica of his favorite vintage car.
Or you can get him a star map with an important date you share.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.