Nope, they're not made by other professions. Yes, you may need reagents from other professions (typically blacksmithing - arrowheads for the better arrows, spear heads, polearm heads, etc), but arrows, bows, crossbows, and shields are not made from other professions that I have seen. And hey, if leatherworkers can make mail gear, why wouldn't woodcrafters be able to make shields?
Musical instruments would be an awesome addition, imo. When used, they could give party members a spirit boost, for example. Or, a flute that, when used, charms/sleeps a mob for 10 seconds.