There are quite a few free aircraft carriers/warships for Flight Simulator. They're not in a Poser-friendly format but maybe if you contact the author they can provide one

http://simviation.com/1/search?submit=1&keywords=nimitz&categoryId=&page=1&filename=

http://www.fs-shipyards.com/index.php?ind=downloads&op=section_view&idev=14

Poser 11 , 180Gb in 8 Runtimes, PaintShop Pro 9
Windows 7 64 bit, Avast AV, Comodo Firewall
Intel Q9550 Quad Core cpu,  16Gb RAM, 250Gb + 250Gb +160Gb HD, GeForce GTX 1060