Custom TF2 player model

I’ve been trying to create a new boss for Freak Fortress 2: Albert Wesker from Resident Evil
I basically need to make a new player model (based on Sniper’s animations) but the bones are different, so the animation doesn’t work properly.
Any ideas? How can I do this? (It’s really urgent I need this to be done in 1-2 days)

https://photos-1.dropbox.com/psi/xl/AEgEX7gy8iu4S8ePlxlAMGvnqx7-8swQzPc7nwASQpM/71300804/1338670800/7e548db/THE%20POWER%20OF%20CHRIST%20COMPELS%20YOU.PNG