I don't know of any reason not to build your own carbon or aluminum arrows. I don't know of anyone who started building them and later changed his mind. Many people build their own wood arrows too, particularly ones used for everyday practice that tend to get lost or broken. Unless you plan to make a whole new hobby out of it, you won't be able to build as beautiful wood arrows as some of our sponsors make. Sometimes I make them, sometimes I buy them. But I make all my own carbon and aluminum arrows.
Just decide if you want right or left wing, and be sure to buy everything to match: feathers, jigs, single bevel broadheads, etc.