Chaz
The Generator should just pull off, no need to cut it off. It does need a bit of wangling to get it off. Mount it just in front of the cab and do not forget to modify the steam supply pipe. The exhaust pipe should then be a straight pipe with a slight kink towards the cab and not the thing that Bachmann supply.
It does look better with the head light bracket mounted on top of the boiler, headlights and brackets (C-16) are available from PSC which Paul supplies. Also do not forget the marker lights, again PSC castings.
Further improvement is replace the chimney with a C-16 one, again PSC castings.
John