Design of Toys

Hello,

I plan to design and build a wooden marble track system for the kids.

I searched for some still existing systems but don´t found something that fits with my imagination.

The system needs to be as simple as possible so that it can be build out of wood without complex shapes.

Also it need to be simple so also smaller kids an handle it.

The plan is to have only some shapes (like straight parts, curves, slopes, ..) and then the kids can combine it like they want.

Here is one shape how it should look like (not final):

Do you have any experience in creating such a system?

I have some problems in creating parts which fit together in any position.

Thank you