OKW and SSR are the only resorts that are exclusively DVC. All the others are attached to Deluxe resorts. AKV is the only one that has had rooms in the existing hotel that have been converted to DVC villas before they built Kidani.
Outside of WDW, Hilton Head is a stand-alone DVC resort. So also is Vero Beach although it has "inn" rooms that are essentially hotel rooms that DVC members can choose rather than studios, which it also has.
None, of course, are DVC exclusive in the sense of actual usage since the stand-alone DVC resorts are available for rental through Disney's central reservations.
I'm not sure if you're asking about the size and configuration of the rooms, or the ability to book rooms as a cash stay.
At Walt Disney World, SSR and OKW are the only resorts that are made up exclusively of timeshare units. The closest things at these resorts to a traditional hotel room would be the studios.
Disney owns a certain percentage of the points at all DVC resorts, and receives additional points each year when members trade out of the DVC system for vacations at RCI resorts or on Disney cruises. Disney uses these points to make rooms available to cash guests. They're booked just like hotel rooms through the WDW Central Reservations Office (CRO).
Actually they are attached to a Disney cash resort, not a DVC resort. It is true that both have their own buildings. BLT's official name is Bay Lake Tower at the Contemporary Resort.
The Treehouse Villas do not have their own check-in area, so they can't function as a resort without SSR. Kidani Village has all the services necessary (except for counter service) to function as a standalone resort.