defence after castling

Well... actually the idea was to discuss any kind of case scenario and if those defences have 100% proof of sustaining whatever appends.
Or defences have to be according to the game in table.

that is the defence system I've been using so far, although it always have it's problems, because you are commonly forced to move one of the pawns or the rook case you desperately need it.



After making castling, which defence with pawns is best? Thinking of the infinite positions and attacks that any pieces of the adversary can do?
(I didn't placed other pieces to not make an exact situation scenario of defences and attacks, but imagine queens, rooks, bishops, and knights wherever you want)
(I didn't placed other pieces to not make an exact situation scenario of defences and attacks, but imagine queens, rooks, bishops, and knights wherever you want)