Depending on how much you want to spend you can get plans from the National Maritime Museum, Greenwich.
For example:
https://www.rmg.co.uk/collections/objects/rmgc-object-54579I got digital copies of the plan, profile and sections for my build of HMS Onslow - not cheap but if it's a long term project the cost is spread a bit. Good photographs are also essential as the plans do not always match the ship, and often include modifications drawn in different ink etc.
They require some interpretation, not drawn with modelmakers in mind (eg I find dimensions on different views don't quite match so you have to use some judgement to make it all fit).
The museum staff can help a bit in sorting out what they have in the archive, I suspect Dreadnought is well covered with multiple different views / time points but it's not always obvious what is shown.
Onslow is not my first build but if you're going for super accuracy the the model can only be as good as the reference material. I found this out the hard way trying to build HMS Kenya from what in hindsight were totally inadequate references...
Hope this helps.
The main thing is enjoy the hobby