Yes, they have full access!

Admission includes all of those locations on the property along with the Mitchell House (off property - separate ticket valid 7 days after purchase). I was there for about 3 hours but would’ve liked another two to see everything. With the Mitchell house ticket I would suggest planning another day. I was unaware of that ticket and was unable to go before I left.

You can purchase at the door. But I would recommend purchasing cyclorama tickets in advance because there are only so many viewings during the day.

I believe we were given a 5 day period to visit both. We did not go to Margaret Mitchell's house but from what I understand it is actually just an apartment within a house and you only visit the apartment as the rest of the house is residential properties. For us it was not worth it.

Sorry I don’t know that

Plenty of parking (they have a garage and you can drop off a person at the door or close by).

You do not. However, the inside and the history is very interesting, and the people there to answer question take on the role of the architect, and others, and it was one of the more enjoyable house tours we have ever experienced. You are free to wander and can engage them as much or as little as you like. But I recommend asking the architect a question, as he has tons of knowledge and insight to share. In either case, enjoy!

they have a free parking deck

There is an All-inclusive tickets that includes the Atlanta History Museum, Smith Family Farm, Swan House, and the Margaret Mitchell House. Adults: $21.50 Seniors (65+): $18.00 Students (13+): $18.00 Youth (4-12): $9.00 Child (0-3): Free

There a some ramps but there are elevators in the building. Sorry for the delay in response. The building is old but they are current with codes.