My layout is 4" long handle, 1.75-2" long fades, I like 1.5" wide fades, and have that stay straight for 10", and then taper to pyamid to the tips.
As far as thickness, 3/4" is good place to start.
Handle, your just going to have to shape out and see what feels good in your hand.
I have been shooting of my hand. Seems to work well. I make mine even tiller because I shoot 3 under.
I am a newbie.
TBB vol. 1 has a good overbuilt layout.
With the handle section being so off center, you might just have to make that bow shorter and bend in the handle.