are any two faces square to each other? if so you might be able to a square rule technique. Also if its a small frame maping each timber also works well. sounds like mapping them would be easier and quicker than scribe rule. I would recomend that you cut all your joinary in the pine than sand so that you do not leave tool marks and other marks that can occur during layout-cutting process. I will also offer to you that i currently have no work lined up and if you would like a hand and willing to pay and put me up for a couple weeks i would be more than glad to come out and help you out. let me no
good luck
matt
e-mail me at eddymatt84@yahoo.com