Do you think that Tywin was considering to make Harrenhal his seat!? And say he would do do you think he had the resource to archive it!?

Close enough: 

“Harrenhal was vast, much of it far gone in decay. Lady Whent had held the castle as bannerman to House Tully, but she’d used only the lower thirds of two of the five towers, and let the rest go to ruin. Now she was fled, and the small household she’d left could not begin to tend the needs of all the knights, lords, and highborn prisoners Lord Tywin had brought, so the Lannisters must forage for servants as well as for plunder and provender. The talk was that Lord Tywin planned to restore Harrenhal to glory, and make it his new seat once the war was done.”
“Weese used Arya to run messages, draw water, and fetch food, and sometimes to serve at table in the Barracks Hall above the armory, where the men-at-arms took their meals. But most of her work was cleaning. The ground floor of the Wailing Tower was given over to storerooms and granaries, and two floors above housed part of the garrison, but the upper stories had not been occupied for eighty years. Now Lord Tywin had commanded that they be made fit for habitation again.”