A newly restored RT-707 can sell for $2k on the Bay, but I think the seller would be lucky to get 1/3 of the asking price if selling as a package. Unfortunately, I think you're right that nobody is going to want individual components that are painted red, even if the seller did spend $16,000 to do it. At that price, one would assume they were well-to-do enough to not care about what it did to the value of the components. And a vintage Technics enthusiast (presumably there are such people), if buying a complete system, would want the panels in the original color.
I actually really lusted over the Technics "pro series" when I was younger and actually have owned a couple of the parametric/graphic EQs (sold them when I realized I never used an EQ), in the original Technics brown. And I wouldn't mind having this system, even in this color, although I have no interest in tape any more. But one has to consider what the same money would buy in modern equipment.