Looking at buying a used frame, that has obviously had rough days. I know the frame is "alloy." The chainstays have a LOT of paint missing, but it's all smooth non-rusted metal. My concern is the headtube and crank/bottom bracket. If the headtube is the same alloy, can't/shouldn't rust. I know the headset is bad, I have a replacement as long as the headtube is fine. Replacing the crank and/or bottom bracket would be annoying. If it can be done for a decent price, I'll try to talk him down. Help GREATLY appreciated. I messaged for better pics.