Initially when we bought the house last year, we knew that we were buying the ugliest house in the neighborhood. Which is fine, if you plan to basically take it down to the walls. Point being, it was such a relief to see that the new roof on the existing house was going to work aesthetically with the addition. Even though none of the new siding is on, we think it is going to look great eventually.
Here's a shot of the addition with the roof completed. We are using a gray toned standing-seam metal roof for both the addition and the original structure. The second story level on the addition is a "additional dwelling unit" aka an apartment that we will rent out once the project is complete. The unit will have a separate entrance from the back of the house, as well as an entrance through the garage. We designed the addition so that one can access the apartment from the main house if it did not want to be used as a rental, but more living space for the main living quarters.
We were fortunate to have Jeremy's dad come up to help us with the framing. His help was so valuable and he and Jeremy were able to knock out the framing of the addition within a few weeks. There was some difficulty in tying the addition into the old roof, but with some thinking through, they devised a plan. 
Here's a picture of our roughed-in radiant flooring system. It will be an open system running off a dedicated tankless water heater. We plan to also have a suspended plan of jip crete in the upstairs apartment and also in the old section of the house. We have never actually installed one of these systems before, so we are learning as we go. But so far, things are lining up and we think that the radiant system will be very effecient.
When we were planning the house, we talked about putting in a water cachement system that would catch rain water run off. We wanted to use all the extra water for lawn watering and possibly more. After living in Arizona for years where we actually had to haul all of our water, both for inside and outside use, we felt like all the extra rain is like gold seeping into the ground. Its funny, however, that putting in water cistern is not a common practice up here, as we found out through the city planning department. In fact, the reaction we received was more along the lines of "now WHAT are you doing?" So, perhaps the idea will catch on and we will all use just a little less water. But for now, at least we will feel 0% guilt about watering our veggie garden next summer!
Here's a picture of our stemwall and rough plumbing. When you are used to doing all the work yourself, you often get trapped in unexpected corners. Take pouring the stemwall, for example. The day the cement trucks were supposed to arrive, both our kids were sick with the flu so me, the wife, couldn't do much to help. Which just left Jeremy to tackle it on his own. About an hour into the process, things were going downhill quickly. The chalk line we had snapped for our plumb line was disappearing in the cement and we had no idea if the cement was setting even. But, after a desperate call to a neighbor and friend, we had enough help to get things back together before the concrete hardened. Um, lesson learned. 
