Here are a couple of articles I've found, unfortunatly no mention of the deck.
It was reported in the press as early as 1932 that some of Mauretania’s public rooms were to be sold off to be reassembled when she was finally scrapped. Among the rooms to be sold was this two-level Dining Saloon with its fabulous balcony and dome, said to have the distinction of being the first use of indirect lighting aboard a liner. Much of the upper level of the Dining Room was purchased by Walter Martin on the second day of the May, 1935 auction held aboard the ship. Martin and other investors would then form The Mauretania Syndicate Ltd. with the intention of selling the rooms whole to a U.S. concern but this never came to be. The lots he purchased, including the upper Dining Room, the octagonal balustrade and the groined dome were reconstructed at Sheds 14-16 of the Old Docks (Inner Docks), Southampton by the Mauretania Syndicate later in 1935. Interest was not as strong as hoped, and the final auction of the remaining lots was held at Shed 16 in October, 1936.
LAST OF A LINER --- THE MAURETANIA SALE ---£15,000 REALISED
Although the Mauretania's next voyage from Southampton docks is to her funeral at Rosyth,
the sting may be taken from her death by a scheme both novel and romantic, says a "Daily Telegraph" reporter. During the eight days' auction of her furniture and appointments the largest buyer was a London cigar merchant and hotelier, Mr. Walter Martin. Of the 3500 lots, something like 1000, including all the panelling of the public rooms, fell to him. When I spoke to him at the end of the sale he did not deny that he thought of building in Guernsey a Hotel Mauretania, in which would be placed much of the liner's woodwork and fittings. If the scheme matures, the hotel's nameplates will be formed of the 2ft brass lettering from the ship's port bow and stern, which Mr. Martin bought
for £213. He also paid £120 for twenty of the thirty lots from the captain's quarters, which realised nearly £200.
The last day was the most interesting of the whole sale, since among its 550 lots were most of the objects which people might be expected to want for their associations rather than their use---the bell, the wheel, the boats, the flags, and the instruments. Hitherto the bidding had been matter-of-fact, among about 200 people. But on the final day 500 crowded the tourist smoke-room ("Smoking Strictly Prohibited"), and even dealers let feeling add guineas to their bids.
On the auctioneer's table stood two small glass-cased models of the Mauretania, and more are to be made from her timbers for those willing to pay two guineas for such a remembrance.
AN APPEAL
The auctioneer appealed quite frankly to the sentiment of final things---"The last day ... a famous ship ... the Blue Riband ..." But at first the hearts of his audience showed little inclination to get the better of their heads. A dealer secured all the pine panelling of the third-class dining saloon for £20, and an offer of 10s for as many bunks brought from the auctioneer the disgusted comment: "And some people want souvenirs of the Mauretania!"
Ten lanterns went at about a pound apiece, and Mr. Martin was able to get 500 coat hangers for £2.
It was the captain's cabins that started reason's abdication. People competed keenly for the armchair in which Sir Arthur Rostron, the Mauretania's commander, most often sat. At last it went for 10 1/2gs to a Mrs. Raynes, of Finchley, who told me that she would give it to her 13-year-old son, with whom ships are a passion. Sir Edward Cunard, a great-grandson of the company's founder, bought a wardrobe. Then a London engineer, Mr. Douglas Sessions, bought the chartroom complete for £30, with the idea of incorporating it in a new house. Afterwards he paid £6 10s for the two "A's" of the starboard bow lettering, which was sold letter by letter. Of these he will make a gong.
The Mauretania's set of code flags was split into sixes for the benefit of souvenir-hunters, but the whole set was bought by another considerable bidder, Mr. H. J. W. Sandrey, Lloyd's agent for the Scilly Isles, who said he had no idea what he would do with his purchases.
THE SHIP'S BELL
A Mr. J. S. Williamson, of Kirkcudbright, paid £3 15s for a small house flag because he took his honeymoon on the Mauretania. The lifeboats---too big for sentimental, and too expensive to convert to practical purposes---went at bargain prices. They cost £250 to £300 to build. They were knocked down to various bidders at from 7 to 21 guineas.
Mr. Sandrey paid 65 guineas for the ship's bell. Lifebuoys were about a fiver apiece. The letter "M" will hang in the home of a Reading seed merchant who made several trips in the Mauretania. The "N" is to be sent to the Salisbury house of a former purser.
It was late in the afternoon before the dispersal, which has brought in £15,000, ended with a proper moment of emotion.
Mr. Sandrey stood on a chair and began the Sational [sic] Anthem. Everybody joined in the words. They were sounding through the ship for the last time.
On July 2 she steams north to her fate, and soon all that will remain of the greatest liner in the world will be the trophies which the auction will scatter to a thousand places.