BUY IT!
(If too expensive, I bet you'll find a better price in the near future. keep watching.)
It is around a 1/470 scale. A whole bunch of 1/440 thru 1/520 scale model ships are still out there and could look great together.
I love the 1/500ish scale. Not too big to display and not too small so details are easy to add.
A few ideas for the future:
NS Savannah (some say 1/445, so close.)
Revell Yorktown class CV's ( 1/487)
Revell Pittsburg/ Helena CA ( 1/480)
Revell Canberra/ Boston CG (1/480)
And then you have the 1/500 stuff by Nichimo, Monogram, Mastercraft, Frog, and Renwal.
The old Revell 1/509 Longbeach and Lindbergs 1/520 Neches tanker round out the similar or "almost close" in-scale stuff.
Sorry that these kits are OOP except for the Atlantis re-pop of Revell and a Renwal kit.
Enjoy your Hospital Ship. Personal attachments make for the best choices in models.
Nino