First off, only someone who likes pain, spending money, and saying lots of cuss words would buy an engine in pieces.
Secondly, I happen to have in front of me the July, 1993 issue of Motorcyclist where they tested the 600's (the 93 Gixxer was same as 92). Here's how Art Friedman summed up the GSX-R: "I see no reason to buy the GSXR. It's heavy, expensive, slow, awkward to ride in the real world and horrifically uncomfortable. I'd rather have a Katana."
Thirdly, there were some good bikes from the 90's (ZX-11, CBR1000, FJ1200, etc.) that only need modern tires, suspension, and brakes to make them into great do-anything bikes. Look for something else.