Thanks to hansmex for pointing out the problem with striped/checkered textures not aligning as they should. Aligning different kinds of textures perfectly, is beyond me, but this update should work better with seamless pattern 20×20 cm.
Model will render with slightly sharper edges/shadows (the price to pay), but good news is that the model is now smaller (37 KB + 6 KB textures - zips to 14 KB).
