Surprisingly, the answer is yes, it is possible to make a DIY science hit at your home. You will find plenty of online resources to help you build a simple and basic experiment kit for your kids. But you should not expect them to work as a high-end Lego robotics kit. But if you are on a tight budget or only want basic functionalities, a homemade science kit can be enough. Prepare to spend quite some time on that though. And if you try to scale a DIY science kit to include more features, you will need to buy a lot of components anyway. Therefore, for more complex projects, making a homemade science kit can be difficult.