The new version (2.2.0) has a new query system that will hide the low level data structures in the model and give you a easier system to work with. are a list of functions in the query object of the grid builder which you can call from a blueprint
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GetCells
GetCellsOfType
GetCellDimension(int32 CellId, FVector& OutCenter, FVector& OutSize);
GetPathBetweenCells(int32 CellA, int32 CellB, TArray<int32>& OutResult, bool& bOutSuccess);
GetFurthestRooms(int32 &OutRoomA, int32 &OutRoomB);
GetCellAtLocation(const FVector& WorldLocation, int32& OutCellId, bool& bOutValid);
GetCellType(int32 CellId);
GetRandomCell();
GetRandomCellOfType(FCellType CellType);
GetRandomCellFromStream(FRandomStream& RandomStream);
GetRandomCellOfTypeFromStream(FCellType CellType, FRandomStream& RandomStream);
ContainsStairBetween(int32 CellA, int32 CellB);
ContainsDoorBetween(int32 CellA, int32 CellB);
GetStairBetween(int32 CellA, int32 CellB);
GetDoorBetween(int32 CellA, int32 CellB);
GetOpeningPointBetweenAdjacentCells(int32 CellA, int32 CellB);
I’ll add more on request