OP If you need someone to assist in looking this bike over with you, then it likely isn't the right fit for you. I agree the price is not a great deal considering the price of parts, (my cruisers tank is just over $1,000 alone), if you want the bike to again look pristine. Look at other ZX-6R's that are reasonable priced and of course despite what the ad says pre 2015 ZX-6R are 600 CC bikes, in 2015 they increased to 636. Also check insurance rates first, with some companies there can be a considerable difference between a 600 and a 636.
Ad says if it isn't sold by tomorrow he is keeping the bike. Let him deal with the damage.