Marble Run Track Extension Parts - Compatible to Gravitrax (R)

I really like the Gravitrax (R) from Ravensburger a lot. I think it is currently the best marble track on the market. However, I there are a couple of things I wanted to improve:

1) In order to build a higher tower, you need to stack many of these gray 10 mm high hexagons. My design allows to stack the parts, using round 6mm plastic rods. You only have to buy some cheap rods and cut them to different lengths, in order to build towers.
See third picture.

2) In the original design you canno