I have played with that build (or similar ones) a few gens, and found it very interesting and fun.
I used a horn bow, some arrows, italian sword or military hammer and heavy round or knightly heater shield.
The problem with it is that bows, arrows and shields are amongst the heaviest items in cRPG, which make you very slow, even with 6 athl and medium armour (byrnie, mail shirt, mail hauberk and similars, leather gloves, straw hat and leather boots).
Bear in mind that hand and head armour decrease your wpf by a lot more than others.
Also with only 5 shield skill, the buckler breaks very easily, and you need to avoid shieldbreakers at all costs (a couple of hits from these and its down). A bigger shield may work better.