[willy]

That is a beautiful boat, but I can tell you from experience that, that is entirely to much motor hanging off the back. That thing will sit low to begin with in a normal notched transom, when you include the fact it is sitting back on a bracket that thing is in for some serious dunking unless you are going to stay on some flat water, all the time.
That rig with a 150 ETEC woould probably be ideal, though I understand from some of the lucky fellows here that the 175 and the 200 hundred don't weigh much more so that may be an option. It would not be mine though, especially at the end of a bracket. JMHO