Thanks for the great advice and shot of courage, Kathie. I tried the scribing technique on one room of the third floor. Sanded the area of some of the poly I had already applied, then drew the horizontal lines with a black ballpoint. A few pulls across and it made a decent imprint. I also added the vertical lines between the floorboards before I added two new coats of poly. I like the way it came out a lot. Probably need to add a few more vertical lines with a fine marker to complete the look. Thanks again for all the support and great ideas. I’m ready to begin dry-fit of the first two assemblies now. Wish me luck.