I've also been a bit inspired by those threads and may try something similar soon. I was looking through the catalogue of Marc's bows on here and the three factors that stand out to me are 1) the high amount of retained reflex, 2) tips are relatively stiff compared to more circular or elliptical tiller in some bows (even in the recurves), and 3) perfect tiller. I have a feeling, even if I could nail the tiller shape, that I would have a hard time retaining as much reflex as Marc does in his bows.