what are you building? just need shafts cut and inserts glued? Carbon, aluminum, or wood? are you doing custom painting and specialized fletching? Are you a member of Evergreen Archery Club? lots of members have their own arrow saws and fletching jigs and enjoy talking shop...
if you buy your arrows at sportsmans warehouse they'll cut them and glue inserts for you. I believe cabelas will, too. Not sure about north 40. Lady Red at Camo'd arrow in chewelah could likely put arrows together for you. Black Sheep might?