I used an 1/8"blade on my bandsaw to do all the cutting, except for a 1/2" blade when making the diagonal rip along the board edge at the beginning. Basically you start out with a 2x6 on its short edge and angle the blade until you get a diagonal cut that goes from the top outside corner down to the bottom inside corner, leaving about 1/8" between the actual corner and the cut. This cut makes the wedges. Angle the blade back to vertical and then rip the long board into 5 equal pieces, resulting in 5 6"x6" squared wedges. Next, number them 1 thru 5, and sand down each face until they are smooth and leave no gaps betwen when you put them face to face, small edge on bottom. On wedge #1 draw a small half circle on the bottom edge center line (you can trace a dime). With the blade set back at the angle used to make the diagonal rip cut, cut out that circle, going clockwise. Then place board#1 on top of board , trace the outline of the cut, cut that piece, place board 2 on top of board 3, trace, cut...repeat this going from board to board tracing each cut onto the next as you go. You will end up with a series of increasing-diameter and thickness wedge arches, as a result of the blade being at an angle. Keep them all in order - they are worse than the bandsaw snake pieces to figure out if they get mixed up

I then sanded the faces of each wedge on a disc sander to smooth out the cuts (very light pressure!), and started glueing them together in pairs. Then those pairs get glued together, until you end up with 4 - 6 wedge assemblies. Here you do the prepatory surface sanding before the thing becomes too curled up on itself. Once you are down to the last wedge assemblies the hard part becomes clamping them together...I used rubber bands but it's stll a bear because of the angles.
In the YouTube video the guy does a pretty abridged version of how he does it, but its enough to grasp the concept. He sells an e-book on EBay, BTW, on how to do it...I guess it probably has all the little details on specific angles and the finishing.
In reality, doing it on the bandsaw was not really that hard - my fingers were never near enough to the blade to be in danger.