paint the roof of the dog house to block the nosy pigs vision.
No looks liek you have everything down pat, cept for the acess prob. that will be easily fixed though i hope. Yeah hippie johns idea will work for your light issue. But as for the fans and noise. I have a cheap way of doing things. And it wont look obvious at all. All you need to do is since they are exhaust fans, set them into the roof jsut a little bit, and make a piece that will allow ventalation to the outside. then you take some insulation like they use in computers it has a sticky side, and the other side is jsut foam, doesnt screw with airflow, and also grabs smell. Trust me, if you rub your hand inside my computer you can smell it.
But the fans wont be a big deal i am jsut worried about it for the pups.. but the insulation would do the trick. Also if you havea couple dryer vents on the sides of the dog house no one would really think anything, you can jsut say it is ventilation for your dog house because her pupies were getting heat stroke in the summer. Use it to your advantage and put a couple intake fans there.