I will be giving a try to making my first self-made wa-handle. It will be - at least this is what I hope to end up with - a D-shaped handle for a right-handed 240 or 270mm wa-gyuto. I already have an idea how to glue materials together and how to do the shaping.
What I am struggling with, as I have no experience with D-shaped handles, is the shape itself, the dimensions, and so on. I understand that for a size like 240 or 270 a total handle length of 5 6/8" (146mm) seems reasonable. A decent taper is an option. Can anyone post a cross-section / lateral cut of the front and rear end? I do not know where to place the finger line... It's not in the vertical center, is it? I guess it is slightly above the vertical center, no?
So, besides the length of 5 6/8" (146mm), what are the dimensions? 21 wide (vertical) and how high? My plan is not to make a huge handle...