It depends what you mean by square. The beech beams I have were originally sawn on a mill, but they dried and some checking occured, some of the faces are no longer flat and true. Do you consider a sawn face square? I'd only consider planed faces square generally and even then you should check to see how close to square they really are. I wasn't intending on using scribe rule on these timbers. I am trying to learn about it though as I may want to incorporate some whole spruce logs I have peeled. Lastly, I do intend to hire a couple of itinerants, but probably not until late winter or spring...or early summer if my schedule gets really off. I will likely post on this board when I am looking.