Gravitrax base board system

Once you starting expanding your set, it quickly feel the need for more room. so I designed a modular base plate; and added the connecting pieces to link with the orignial carton board.

As I was at it, I added the possibility to elevate the board, and design a system that can be compatible with the elevation system of Alex80it (https://www.thingiverse.com/thing:3750276) .
After playing with it I realize that the platform base wa conflicting when you link it and have some slope, so I redesigned it with a removable locking key, and included 2 versions tight and very tight, depending on the material use, print and test!

feel free to comment, and to like it, I'd love to get feed back and see your makes!