When you forward align the bracket you will need the proper thickness washers or shims to fit here. If the washers are too thick you can sand them to the correct thickness with some sand paper. This takes time so be patient.
The Addition of the saddle mount makes lots of sense. It certainly provides a much more stable mount for a high output alternator, as the saddle mount alternator provides much more resistance to torque under load. Combine that with a set of serpentine pulleys, and you'd have the perfect solution for charging a large set of house batteries! Nice work.