I'm pretty sure that SSR is more of the OKW design. The main reason I think that is that our guide, Glenn, was saying that he loves OKW much more than any other DVC resort at WDW. Said the design was somewhat "unique", but that SSR was similar in style.
The indoor or outdoor hall is a question I'm not sure has been answered. Some seemed to think it would be interior, but looking at the photos I think it may be like OKW with outdoor walkways.
I read somewhere that there are interior hallways. After looking at the pictures...I can't really see where exterior entrances would be (other than the patio doors).