JT is where I am - why do the hardest part and quit. Your basic billet would be the start for a bold twist pattern. Forge weld the billet as a square bar (eg. 1X1X8" ), forge to round, and twist the heck out of it at welding heat. Then forge to a bar and make some k ives.
Several patterns of mosaic damascus are made as a block and sliced off as in your sketch, but the length is rarely long enough to make a knife.