So, are you trying to decide between modelling the original, 1866-68 Woolich-built floating dock or its 1902-06 Swan & Hunter replacement? Or are you going to do both?

Some more lithographs of the original floating dock from its delivery:
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https://www.bada.org/object/largest-floating-dock-worldThe satellite view of the wreck in situ (in your Bing link) is very cool. That whole scene would make for a very cool diorama (were one a glutton for modelling punishment).

Q: I know that the Swan & Hunter replacement was called H.M. Floating Dock, was the Woolich version also named that? (She mostly seems to be referred to as 'Admiralty Floating Dock Bermuda'.)
For those wondering, the wreck at Spanish Point is the original floating dock. [1] After retirement, she was stripped of non-ferrous metals, and towed out for scrapping. However, she broke loose in a gale and was grounded. Since then, she has successfully resisted all attempts to remove or break her up.
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[1] The Swan & Hunter H.M. Floating Dock - aka Admiralty Floating Dock No. 1 - served until March 1950. In July 1951, she left Bermuda under tow for scrapping at Falmouth.