Lookin good! Have you purchased any scale material yet?
Just a personal preference, but I like to do my hand sanding with a hard back and then merely do the last grit or two (depend on geometry) with a "soft" backing like you showed above. I just use a piece of paper micarta (about 1 1/4" x 5") for the main sanding backing and then the opposite side of it has a thin piece of high duro gasket material super glued on it, which was just some left over cut-offs from the "soft" back disc I made for my disc grinder for higher grits. That material you have above sounds perfect for especially the finishing grits and passes.
I've found the hard(er) backing helps keep everything crisp while going up through the grits and then soft helps to blend and smooth the scratch pattern. The hard backing is nice for for sanding the ricasso and the start of the tang without rounding over the edge of plunge or rounding over the top and bottom edges (spine) of the tang, as well as for sanding clips or swedges without washing out the transitions from clip to bevel. You'll probably find yourself making at least a couple of different sanding sticks in various shapes, sizes, and/or materials after a while.
Another thing, which honestly may not matter much to you, is that it looks like you can save at least an extra 1/2" of steel per blade by moving the tips closer in to the blade's belly and just make the cut at an angle, which may leave you with enough extra steel at the end to make a smaller knife. Like I said, it probably doesn't matter much, but I'm cheap like that lol, so I like to as much extra length as I can. You might have enough for something like a smaller kiridashi that you can sell off to use the cash for an extra bar of steel or some belts etc.
Anyway, this may or may not be helpful so take it for what it's worth.
~Paul
My Youtube Channel
... (Just some older videos of some knives I've made in the past)