That can be repaired..Its not a total basket case..I hope the motor still runs..You will need to fabricate a new front end to include the platform in front of the boiler,pilot beam and steps.This can be done by using ABS plastic shapes..The good part is most will be form for you..Use the "L' angle for steps,solid square for the pilot beam and flat for the front platform,small square for support bracing under the front platform..Grabs and front boiler bracing to the boiler plate(front platform) use .010 wire(if it is N scale).015 for HO...
As far as that seller,a negative feed back seems to be in order.