I was going through some boxes of MRR stuff and came across a scratchbuilt model of a goldmine shaft I had started to build about twenty years ago, but never got around to finishing it. I wanted it to look as though it was still fairly new, so I didn't weather it too much. I added the knots by heating a pin over an alcohol burner and pressing them into the wood. As you can see, the results were rather favorable. The wood siding is board and batten milled basswood that I stained with a "light" grey wash. It was almost all thinner, if I remember correctly. I recommend using a pair of locking pliers or hemostats to hold the pin while it's hot. It's neat the way a small stream of smoke shoots out of the wood when the pin is applied. It is alittle stinky, but so are half of the chemicals and paints that are used on my layout, so it's bearable, but you may want to do it outside to keep the better half happy. (I quit smoking, so I can't use that excuse ) I'm not claiming to be the originator this technique. Heck, I may have read it in a mag at sometime and just forgot where I read about it, but I thought it would make a nice addition to useful technique file. The last pic is of the headframe that the siding was going to cover.