Yes, it's a fine build. Go ahead and follow it. It allows you to use Light Crossbow on horse, and Heavy Crossbow for those maps where horse isn't a good option (most city maps).
Once you reach high levels, before you raise your Crossbow WPF above ~160-165, stop and think about whether you really want a marginally smaller crosshair, or if you want to be slightly better with the 1-hander. You might want to consider putting 50-100 WPF into 1-hander at that point, at the cost of only a few points of Crossbow WPF.