Castling would be Free Castling (like in Gross Chess), where an unmoved K can move 2, 3 or possibly 4 steps towards an unmoved R, with said R ending up on the square adjacent to the K on the other side of it, on the first rank.
This is called flexible castling. Free castling, which is not used in Gross Chess, gives you more options for where to place the Rook.
This is called flexible castling. Free castling, which is not used in Gross Chess, gives you more options for where to place the Rook.