Nice models, you have the timbers just right.

Try this approach. Its just the one polygon square prop from the library with your texture. I also used it as the bump map. If you have Poser 5 you could add displacement. If you need to see the ridges better use a six sided cube elongated and scaled for each. No smoothing but you could split the verts in UVMapper. Just out of curiosity how many polygons is in your panel?