Hi Christian,
I'm the panel beater trustr32 AKA brodie took up from tassie. I have a fair amount of mechanical knowledge when it comes to skylines also. Overall its not a bad car, but the sill panels/floor pans that are damaged do bother me. The car also has had a repair on the Right hand rear quater panel, on the front of the wheel arch section. It has plug welds etc and the repair looks kinda average and it showing signs of letting go soon enough. nothing to stop the world, but exspense on the horizon. As Trust32 mentioned, its been resrayed, not the best, not the worst.
Compared to some of the other GTR's on the market up there, its really not bad.
I actually drove the car, and I thought it was pretty good to drive. Clutch doesnt feel that great, engages really late. Has a short shifter in it also.
all in all mate its a reasonable car, And I'm sure it hasnt been in a major smash. Front rails are clean, rear quater panels/boot floor beaver/back panel and all sealers etc look pretty spot on. But the Right hand quater has had a tap and the door didnt close how I like, gap wasnt 100%. probably not noticable to the average joe, I am fussy!!. Hence why trustr32 put up with my constant moaning/whining and general poor additude. Not to mention I cost him a fortune Muhahah lol
jot down all the things you have against it and offer them 17,000.
Or keep looking!