Well, we've been in and out of town again to visit with our far-flung siblings, so we've been getting more photo updates from our sweet neighbor. Here it is on June 27, when the 3-1/2" of rigid foam were being applied to the exterior. There are two layer of insulation (2" and then 1-1/2") with staggered seams to further discourage any air leakage. On top of this there is another layer of OSB to help with the rigidity of the vinyl siding, and then a layer of housewrap. This system (in addition to the interior insulation to be added after the house is weather-tight) should keep us very warm and cozy come winter!
We also had some progress on the garage,. The foundation is in!