You'd need to connect with an architect like Samuel or a structural engineer.You can of course install a hatch, but make sure someone who knows what they are doing from a roof standpoint does it.Happy to chat in more detail if that would help.

Just because you are given the same data as someone else does not mean you will make the same decisions. 

For instance - someone buys the house - do they come complain to me because it's drafty and cold?

Looking for real estate focused tax advisors for new investors, someone who will take time to explain and advise benefits, best practices and any areas of concern in real estate investing based on our current financial portfolio.  

With this being said, I've shared the link through my One Drive so that someone else who finds it useful can download it and try it out.  

I know of a guy here in the greater Seattle area that might be able to advise or at least get you in touch with someone locally that is reputable.The key here, IMHO (and I am not an attorney or anything), is to keep everything stabilized.

Do you know of any instances where someone built something in a similar circumstance?

If you can get $3100 or more then rent it out to someone else that is better qualified. 

We could possibly help you or connect you with someone in the area! 

Makes sense, because if someone is searching for that and you have 4-5+ bedrooms it wipes out 90%+ of the competition in most markets.