This is what I have done, and it worked out well, although I probably shorted myself in the beginning by taking only one third of their walnut and cedar (I now ask for one half). I saw their logs per their specifications. When finished, I call them to come over and divide the boards. If splitting halves, I put two boards of similar grade together and let the customer pick the one they want. Then I get the other. We repeat that until we're done. I only do this now for valuable species. I've also split up logs by tabulating board feet and then just cutting their portion.