First of all thanks to all those which accepted to share their knowledge in this thread. It's being incredibly instructive.
Money is not a problem thank God but going the Minh route means shelling more dough than what I've ever spent for a gen Rolex/Tudor. Of course I understand that this here piece is something a little more valuable than your standard 3,5k submariner and comparing the cost of the "real thing" with that of Minh's rep is futile. If that 6542 had been built by someone in the forum with a name and credibility, someone which would have had the possibility to give a context, relate the story of the piece perhaps I would have pulled the trigger. Not like this.
Anyhow Minh has been replying. His price is USD 4200 shipping included as you all had guessed. Now I have enquired on the price of the dial, that would be a good starting point provided Minh does not ask 1k for it
I have tried to look at Ingod as Akira pointed out. There's a "1675 PanAm dial" which looks quite good for 155$ (out of stock currently), so Minh's could be an alternative I think. Pure Time's case seems to be generally considered as an ok option, the rest as elegantly described by Panerai and Freddy. I most definitely am going to try and give a go at this with a little help from a friend. Let's see if something good eventually comes out.
I'll tell you: I need this little project right now in order to assimilate what happened today: As some of you may know I was the lucky guy which bought Zeleni's 1675. Today the parcel has reached my door but, to my dismay, it contains a bracelet and four inserts. The watch has been stolen. Someone en route has been opening the box, taking the watch and closing the box with a piece of scotch tape. I currently am in touch with Zeleni and we're gonna try to get the money back as the parcel was insured. It's gonna be a mess and I'm not optimistic as to that I'll ever be granted any refund. On top of that is the loss of a watch I had bought because I really liked it and which now is gone... Well at least now I have a nice new folded bracelet, if only a trifle expensive...
C'est la vie! But I really hope this new 6542 project is going to help me forget this little misfortune.