MK1V's were extensively advertised in 2012 at inflated speculative prices as it was the 50th anniversary of the Cobra. Very few actually sold though but, they are still trading at more than double where they were 10 years ago. Not a bad return.
If you want an aluminum Cobra and can afford one, it starts with the MK1V in its genuine AC guise versus Kirkham. One other genuine AC Cars manufactured option is the Continuation series, though these trade at in excess of £175k (effectively AC built as an exact '60's Thames Ditton car). Shelby also produced some similar cars but, these are also likewise expensive. Some of the Shelby body chassis units were supplied by AC Cars.
The Kirkham has a lot to offer but, the last one I saw actually sell went for only c.£65k, less than the sum of its parts, not to mention all the labour on top. Will they ever command strong money I wonder? I suspect not as they are a replica and that is always going to put buyers off unless they are something of a bargain - like some Bugatti Type 35 replicas.
Brian Angliss effectively continued the AC name after the Hurlocks lost interest, having established and served the brand and put their time into growing a unique business. Nothing wrong with that, nor Brian Angliss purchasing the company then handing it over to Alan Lubinsky. After all, Ron Dennis did not start the McLaren F1 team but the cars still carry the brand quite legitimately. Aston Martin is another case in point and, like AC, Ford once owned a stake in that too.
The MK1V was in many ways like the Morgan offering of the time - the traditional shape with modern technology and updated interiors creeping in. The more traditional MK1V Lightweight was available for those with deeper pockets. The original Thames Ditton cars will always be more desirable but, few can afford to commit the funds to ownership.
Emmanueld's 428 is a very nice custom car that can have the modernised parts removed easily for it to be converted back by future owners to the old barge it was when it left the factory. Nothing wrong with that and all part of the Thames Ditton DNA that can be returned to the car at any time to no doubt increase its value a little too. I am not sure why you think the MK1V has a Frua chassis but, I can send you a picture of a MK1V stripped to the bone. Frua it is not, though it does resemble it in some respects.
There is a lot to be said for a CRS at c.£40k if that is your budget and it is unlikely to depreciate, though a lovely DB7 V12 Vantage could be bought for less. No sense in old car values, that's for sure. Just sentiment.