In principle, the Tamiya "E" class kit or the AJM kits of HMS Fame or HMS Express could be converted to Faulknor, However, much would depend upon (a) which period is to be modelled and (b) how accurate a representation is required. Note that all three of the kits mentioned represent their subjects at different periods and in different armament configurations. The Wikipedia article on Faulknor gives a reasonable summary of her armament changes.
For Faulknor, the hull of any of the kits would need extending (she was 14 feet longer overall, with extra length both for'd and aft of the foc's'le break), boats moved for'd to make space for an additional 4.7" gun and gundeck between the funnels, light AA in the bridge wings, a wider after deckhouse, changes to the quarterdeck layout and fittings, wider bridge wings and a longer bridge.
Admittedly, British destoyers are a weak spot in my naval knowledge.
That being said ?
Can a 1:700 HMS FAULKNOR be fashioned from an existing kit, possibly a Tamiya E class ?
Now I have heard that British destroyer classes are usually very similar next to their assigned lettered groups- as in, potentially, that E,F & G classes can be sometimes indistinguishable from one another.... is this true, for the most part ?
And what would be a good starting point for FAULKNOR; the E class from Tamiya ?
As always, thanks for any imput here & enjoy your weekend !!