Another nice looking design, ! I got there, but some of the moves didn't work smoothly... The second ball didn't always roll out and started to roll back in before I was ready to use it again. You could build the whole structure on a platform of one or two layers of blocks, then you can use some wedge shaped pieces to get the balls to settle where you need them. The piece you pull out to release the ball comes out completely, that is what is called a free- draggable (or FD). Some players can use a FD to pull up and across the win block so it's best to always fix them onto a slider rail, .
