Re: Converting i/o to twin power towers!
I'd go with the outboard bracket. I have not read a single post about anyone complaining about the conversion. In fact, in the 5 or so years I have been on this forum, I have never read about anyone here doing a conversion with a bracket, so I don't think you will find much info on this forum about it.
Brackets are more popular with the off-shore fishing crowd. Its nice to have twin outboards when that far out just so when one breaks down, there is still one left to limp home on.
There are lots of bracket manufacturers out there. If it didn't work, they would not be in business.
Armstrong bracket: