Nick, I just did some research on wood marble runs and the one you posted is 1 of 4 in a series that was rated #1 wood marble run puzzle for 2021.
I think with all the drag of wood construction a Larger run would not be ideal for small steam power. So I have changed my mind...the one you posted is likely one of the best Current offerings for our use. Thanks for sharing!!
I fell in love with that one 😍 till I seen the price!!