Campagnolo Chorus 10s rear mech—not enough range for frame?

lol from the sale thread when i bought the frame:

However, there are a few minor issues that came to light after I had purchased it. The rear derailleur hanger part of the frame, I believe it has been repaired at some point in its life, as it looks non standard. I asked the previous owner if it had ever been crashed and he said no, so perhaps it's a non standard 595 drop out. Anyway, it works perfectly. It's a little thick so if you are thinking of running it 11 speed then I'm not sure you would be able to access the biggest cog. I was running it with sram force 10 speed just fine.