It's just cast iron. It can be powder coated. Watch all the machined surfaces. Take them in as bare cases and LOTS of masking. That much iron will take longer than normal to get up to temp and longer to cool off. Any good powder coater will know that. IF you are trying it at home, it will take a longer bake cycle to really get the iron up to temp.
If it was powdercoated correctly, just put it back together. If it was done wrong, got powder inside or on machined surfaces, get to cleaning or it isn't going together right.