Some thoughts on single vs twins in here.
http://edis.ifas.ufl.edu/pdffiles/EH/EH20200.pdf
Also, There is a very successful SKA Team that uses twin Suzuki's and were even featured in 2006 on the SKA TV show. Can't remember the name.
ReelPeace charters out of Venice, LA just lost a boat due to failure of both motors....investigation still underway, but probably electrical failure.....boat destroyed by oil rig in tow.
I'd still like a twin screw option and maybe they will get the engine bracket idea back in development.