The Orbo works basically by attracting the magnets to the toroid then pulsing the toroid to cancel the attraction just as it passes, so the rotor coasts by. For this to work you must have the magnets spaced out... which is why they have 4, one each 90 degrees.
You could scale this up by increasing the diameter, which allows you to add more magnets and still have the needed spacing, or add more rotors on the same shaft.
But you are still "coasting" past the magnetic attraction once you turn it off, so it makes it hard to pull much torque out of this to power a load.
If you want to get anywhere with this, you would have to invest a lot of time and money. You would need a multi-phase system where you always have a lot more phases in attraction mode while one is coasting by, so you can maintain some amount of torque and momentum.
If anyone is seriously interested in this, I could help you with a design and machine work, but I am not spending any money on this.