I think the hull shape fits the blockade running sidewheeler profile. I read a 2008 article back when it was discovered "again" after a hurricane and the reporter said the historians found steel cable and asbestos tile among the wreckage. This was their "proof" that it was not from the mid 19th Century. However, a quick look at books published between 1800 and 1865 prove that asbetos was being used to insulate steam engine parts as far back as 1824, and that steel cables did exist on ships during this period. Steam boilers were lined with asbestos during the mid-eighteen hundreds.

Appleton's Dictionary of Machines, Mechanics, Engine-work and Engineering, 1857, page 230-- Cloric Engine, Ericsson's Patent--"two vessels of cubical form filled to their utmost capacity, excepting small spaces at top and bottom, with disks of wire net, or straight wires closely packed, or with other small metallic substances, or mineral substances, such as asbestos, so arranged as to have minute channels running up and down."

William Peters, of Baltimore, Md., assignor to Himself and Alfred Buck, of the same place.—Improvement in Covering Steam Boilers.—Patent dated August 26, 1862.—This invention consists in covering steam boilers, pipes, cylinders, &c, with sheets or slabs made of a combination of asbestos and hemp, or some vegetable or animal fibre or material, or with mineral substances.

Specification of the Patent granted to Richard Lloyd, of Paris, in the Republic of France, Engineer, for Improvements in Steam-Engines, and Heating Steam. — Sealed July 28, 1851.—(Communication.)"...It has hitherto been found that in all attempts to employ highly surcharged steam, the packings of the piston, piston-rod, stuffing-boxes, and all other packed joints, are much injured by the superior heat of the steam; to remedy this inconvenience I spin or mat together asbestos, with or without, as the case may require, steel wire or springs, and ordinary tallow. I find the asbestos alone to perfectly resist the most intense heat, and when spun into thread and a sort of cloth is made, it is very serviceable for making all sorts of steam-joints, stuffingboxes, and packings of pistons, where highly heated or surcharged steam is employed..."

David