(generally) with log cabin blocks the seams are pressed to one side- away from the center as you go around the *cabin* you use a stitch & flip method of construction- in my mind trying to press them open would be a (nightmare) but you could grab some scraps & make a practice block to try it out & see which way you like best....it would be much more time consuming to do it though-
many people do not *press* as each strip is added- they sew on the strip- open it- finger press, add next strip, open, finger press (so everything just keeps going in the same direction) then press the finished block---if it needs it