Thanks to the folks at GREENPOWERSCIENCE, (http://www.youtube.com/user/GREENPOWERSCIENCE , http://www.youtube.com/watch?v=23kkZZN1ACs) I now know it’s possible to cut a perfect circle on a standard table saw, and just how to do it. The trick is to go slow.
A porthole! Attic access, and a sense of more ‘up’ space, and adding stability to the aluminum roof. Plus, it’s pretty. A little more work, and I think it will operate just like the Transporter on the Starship Enterprise. At least that’s the plan.