This is a beautiful looking garage. I'm quite jealous of a few points. I built a double garage a couple of years ago myself and it is way over engineered. Double skin insulated brick walls, deep foundations, brick pit, metal girders in the roof for lifting stuff, very expensive roller door, yet it doesnt look as pretty and homely as yours. I may steal your feather edge idea and win some points off the missus as it will enhance the whole garden. I wish i had put transparent panels in the roof now too as i love all the light in yours. Very nice job!
The roof lights do make for a good working environment in terms of light levels but it does get a bit toasty in there in the summer - would probably use fewer clear panels and/or add a couple of vents to the apex if I was doing it again but overall pretty happy with it.