I cut grooves on regular spacing on both sides but staggered. This will give it the regularity of pattern.
As you see, the blade taper and bevels are semi forged while allowing some (not much) reduction after the grooves are ground in.
Here I am forging the grooves out and finalizing the blade's shape. As you see I am starting near the back working toward the tip.
Here is the forged blade. I have done no profiling so I may change the look some but I kind of like the profile the way it is.
It turned out to be 13 inches.