I think I'd try and go for a 'living roof', either grass or mosses (and that would be all green, too, so even more Hobbity) and have it more scruffy and plant-filled around the door, but the interior is lovely.
And I want to go and sit and look through his bookshelves and mess with those maquettes. He looks like a nice man, I think he should offer field trips.
I am laughing though, because of my theory that all blokes need a shed to escape to - this guy has the best shed
ever made. And he admits his wife has to call him back into the house.