1. it's a korean mid-level guitar and frankly nothing like any old Kramer. Not worth it IMO, especially the finish used is abysmal, as is the shaping of the neck joint. A real floyd is a straight swap and would work fine, but it makes little sense IMO
2. GKG get their parts pre-shaped from elsewhere, I guess the korean factory that makes their cheaper models. Not many extras to choose from, they won't do custom headstocks etc. I had a bad experience with their CS (too wide body at the neck joint, 14" Gotoh paired with a 10" neck radius etc.) and would not really recommend going for it. The wood was great though and after getting a new neck from a local luthier, it is my main player. Still, wouldn't do it again, especially not for almost $3k. To be fair, they did offer me a refund after I made some noise in the old forum, but by then I already had the new neck installed so I kept it.
There are guys building way better Kramer copies for a third of that money, I can wholeheartedly recommend Musikraft/Jamerson for example. They will also do custom headstock shapes and many other custom options unthinkable elsewhere
3. Meanstreet Guitars is a former "old" forum member. I can recommend his pickups, also his Wolfie/Axis kits are great bang for the buck, though the woods used were not really high-end. Dunno about his retta copies, haven't played those - may be higher grade woods used there. His finishing work is awesome
May be worth a try, but ask him about the woods he uses for those
4. MusicYo model? Those were much better than the later korean Gibson stuff, but the necks and the feel were totally different (very thick profile, usually 16" and unfinished, often bad fretwork but that's fixable). Bodies were alder and had some seriously great tone. These are nice guitars in their own right, but the resemblance is purely visual. I liked mine very much, should have kept it...
5. "the" thing, but expensive usually...
Nothing will be exactly like the original of course. Otherwise, IMO Musikraft is your best bet, top-notch woods and top-notch work, many options available and it won't cost you an arm and leg.