The string looks like it's actually braided rather than twisted where the loops merge? It looks cool too
D-97 is a very good string material. The best string I've made is 10 strands of D-97 with the Chinese style knot, single piece. Quiet and fast..
Would 452X have any more stretch than D-97?.. I don't think its stability from creep matters as much as with primitive bows, it seems like vectran is more prone to fraying than dyneema too? but if it has more friction that may be good.
I love the bow, it looks primitive and well made.