Carriage House is the building with check-in, the two restaurants, the club house for the golf course, some lounge areas, etc. There are no villas there.
I'm not remembering which building numbers go with which sections...but I think the 8100s are Grand Stand...it's about a 5-minute walk from check-in at Carriage House to the closest of the Grandstand's four buildings (add another 5 minutes or so to the furthest of the Grandstand buildings)--there's a themed pool (w/out a slide), a poolside snack/drink bar, a kids' wet/spray play area, a barbeque area, and the bus stop is the first so you always get a seat on the bus. It's also got some golf course views and a lovely short-ish (7-8 minutes?) walk to Downtown Disney West Side..we like Grandstand a whole lot.
For older kids, SSR's key advantage is its proximity to Downtown Disney ... my DS during his college years LOVED being able to head over to Downtown Disney (usually had a friend or two w/him) at night...
SSR vies w/BCV as my favorite
DVC resort; it comes in third for DS, who puts AKV and BCV ahead of SSR (we've stayed at all but Wilderness Lodge)...
It's a big, sprawling resort--very very pretty...2 very cool feature pools w/slides (the main pool behind the Carriage House and a new one over in the Paddock) plus a third themed pool w/the splash area (Grandstand) and a nice "quiet pool" at Congress Park...lots of pretty walkways...
LOVE LOVE LOVE SSR...hope you enjoy it as much as we do...