Adding spline points to projectile collision location

The plan is to use multiple projectile impact locations to track and build a path in front of the player character. Standing on this player built path will give that player a speed boost.

I’ve been trying to use splines to accomplish this feat but am having a lot of trouble. Would appreciate any advice you may have to offer. (are splines even able to be manipulated in this way outside of construction script)?

Kind regards,