sounds about right, you would probably need some sort of jig to hold your bows in that is square/straight in relation to the laser to begin with, kind of like the wall lasers with the level built in. you know the laser is level on the wall and it shoots a straight line down it. you could probably use a bostitch frame laser level that clamps to a 2x4 to make a simple rig that you could adjust to whatever bow you are building, as long as the bow jig and the 2x4 piece are square to each other. the spinning ones would probably be nice too but ive never seen them in action so i cant say, but if they spin fast enough you could make a simple overhang jig to hold them square over a bow youre working on. i think the norm is that most are pole mounted, which could be accomadated with some thick round railing.