I am one who thinks it does matter whether it is 65 years or 6 months old. Given a choice, most buyers will want the more 'original' vehicle and prices will generally reflect this. I'm not talking about condition but originality.
All restorations will incorporate new parts to some degree, that is inevitable but it concerns my that new build vehicles are seen as being the same as an original example. Yes, they are both carriers but surely not of equal historical importance.
I stress again, I have nothing against new build, it is a way of having more vehicles and seeing again some extinct examples as is being seen in the aircraft world. They are what they are however and as long as we are open about it if and when we sell, there is no problem. If you are doing it for yourself, as Martyn is then he only has himself to please and looking at his pics he has a lot to be proud of.