A few weeks ago, Paul and I spent some time installing the aged wood (a.k.a. my Moms's old goat pen) in the sunroon (see previous post). I thought it would be a quick process (measure, cut, apply), but Paul is much more a perfectionist than I am. I repeatedly tried to convince him that everything in the cabin is rough and/or crooked, so level, straight, and beveled were not necessary. I won part of the argument and he won another part. In the end, it took the better part of two days to do the window casings & sills and about 2/3 of the walls. 
We put in a narrow shelf up high for some art work. The pieces selected for the shelf and window wills were all boards that had been extensively chewed by one of my mother's favorite horses. It's tricky to see in the photo above, but the sills have wonderful rounded, organic quality, each is different and there are more than a few tooth marks. It was a unique way to incorporate a bit of family history into the project.
Paul was pretty adamant about beveling the edges around the door, and although it took a bit of thought to figure out the correct way to cut each board (many incorrect cuts were made!), the extra effort was worth it. The door looks elegant and rustic at the same time.
The boards were all 1" thick (back in the days when a 1x12 was actually 1x12!), and although beautifully aged and silvery on the exterior, there was no decay on the interior. The wood was purchased 17 years ago (the building of the goat pen coincided with the birth of a favorite horse), but when we cut into it, it smelled fresh and piney. I honestly don't know if you can get good wood like that anymore. Quite a few knots had fallen out, but this gave us the opportunity to hide bits of old regional topo maps behind the wood. We now have quite a few 'Easter eggs' hidden through the room highlighting local rivers, mountains, and towns. Some of the wood has beetle damage and large splits, but it was slapped onto the wall no questions asked. With a project like this, you never really know how it will end up, but I think it looks great and I can't argue with the cost (zero!).