Completely ruined my mc22 cbr250rr help !?

Okay , so the one thing you don't do when jump starting is cross the wires, I did the exact thing , the mechanic told me if I did that it wouldn't be worth fixing and it'd be best at the scrap yard , well I love my cbr and I want it fixed anyways , that and I already paid for and have brand new red bull fairings for it , which would just be a complete waste of my money, so long post short , how much would it cost to fix anyways ? And what's broken that has to be change on it now that I'm a dick head and shorted the whole thing .