Interesting concept with potential.
I see the guide wall system and starting and stopping (take off and landing) will be the hard parts of this design. Also making sure the train can handle sudden emergency decelerations without plowing into the ground will be a key issue.
Do they even need rails for this or can tires handle the take off and landing? Again that could further simplify the design and lower the cost to build both the train and the guide walls.
The major upside over maglev is that in theory it should be far less costly to build and operate.