Following Nikon Shooter's, "Let's Get Crazy'' thread on fantasy lenses, how about you're fantasy camera body that doesn't exist? Either start with something way out there, or choose your favorite model FX with the custom features you would like to have added or detracted.
As for me, I'll take a D700 with a few upgrades. How about a 20MP sensor, Low ISO of 100, boosted to 50, 5:4 image ratio as well as 3:2, and another CF card slot. That should do it for me.
Why not just get a D600-D610-D750-D780-D800-D810-D850? I want to keep the MP at around 20, and only the D800 can come close to the build quality of the D700. Okay, what about a D5 or a D6 then? I can take the battery grip off my D700 making it both smaller and lighter, plus the little on board flash may come in handy at times and it only pops up when I want it.
I think a 20MP D700 was on the drawing board until someone ask, "Won't that take sales away from our flagship cameras?''
What's your phantom/custom Nikon?