Hi Dan, GPM still have the detail set available on their website - I got mine and the kit direct from them which was the cheapest and quickest way for me; a good company, they even refunded postage costs in excess of what they had quoted which I've not experienced before.
I would say that you will need the detail set soon after completing the hull; I've found that it's best to add all this stuff as you go along.
Best wishes for your build!
Chris
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