Had some nice comments on the sidings in the interior of my new building and some requests for how I made them so here goes. I think the picture will tell it all the saw I use is a junior hack saw as I do not have one of those cute small tenon saws, The width of the block with the saw cuts helps to guide the blade and keep the groove square.Cut the sawcuts using a square as indicated to the width of your scale planks and as many as suits your material ,Styrene or wood, stained my sidings with cold tea and am pleased with the result,looks like Cedar