The thing about Lugers is that their historical niche is about the only thing they have going for them, in today's world.
Many find the grip angle to be good, a natural pointer, and the magazine catch button is in the "right" place, but other than that, the Luger comes off worse, when compared to today's "duty" pistols. And, as it should, considering that today's pistols were designed after seeing 60,70, 80, years (or even a century) AFTER the Luger.
The Luger is 9mm Luger. NOT 9mm+p or +p+ so take off points there...
Single stack magazine, take off lots of points,,,,,
Safety in an awkward location (although following the European school that safeties should be operated with the "off" hand) US raters, take off points, European raters = a pass
Triggers are not great, (though better than GLocks that I've shot!
)
Sights are ...poor (but in fairness, ALL pistols of that design era had poor sights by today's standards) take off a few more points...
If you want to sell Luger clones at $5k, make them in .45ACP!! You'll sell a ton of them, just for the novelty. Make the 9mm version to handle the hottest possible loads. The toggle action is very efficient, and can be made to handle high pressure rounds.
Better yet, do the needed "stretching" and make them in .45 Win Mag, or best, .44 Magnum!!!
Keep the iconic exterior look of the P.08 (as much as possible, put good adjustable sights on it), but beef up/redesign the internals to handle modern pressures and bigger rounds and you'll have a winner in a niche market.
Make a double stack version in 9mm Luger (or 9mm Win Mag!)
Don't know about the long run, but in the short run, I bet you would sell every one you built!
Best yet, find some billionaire to fund the operation, then sell them at the price of a Hi Point, and lose money on every gun. Win/win, cool pistol at an affordable price, and Daddy Big Bucks gets to claim the loss as a tax write off!
But, even IF possible, DO NOT make the frame out of plastic!!!