It's not you that's in error. It's Occre!
Dunno where they got the idea she was built as a Frigate.
Uncle Wiki has a very different opinion.
"The ship was launched on 17 December 1912 and was initially christened Polaris after the North Star. She was 144 ft (44 m) long, with a 25 ft (7.6 m) beam, and measured 350 tons gross. Her original purpose was to provide luxurious accommodation for small tourist and hunting parties in the Arctic as an ice-capable steam yacht. As launched she had 10 passenger cabins, a spacious dining saloon and galley (with accommodation for two cooks), a smoking room, a darkroom to allow passengers to develop photographs, electric lighting and even a small bathroom."
Hardly a description of a ship equipped for war!😉
She was built as a barquentine or schooner barque. Shackleton made many alterations to the internal layout but the ship was built with steam power from the get go - not converted.
I agree, a fine looking model 'Expert grade'?😮
See full history here
and model kit with lotsa piccies in second link.