Might be time to bring this thread to an end..
After waiting patiently for 4 months, the motor finally arrived this week (Yamaha 150hp DEC 2.8L)
I have to admit I was a bit nervous about the sea trials given the amount of hours which went into the project.
Despite a few minor setup/teething problems (to be expected), she floated perfectly on her lines and went like a dream!
I am so happy with the performance. A well mannered hull with such a dry and smooth ride. At-rest stability was great as well.
All the hard work was suddenly forgotten after seeing my wife and young sons face light up we put the throttle down - which was approaching 40knots on the yamaha gauge!
He has been a champ helping me out from time to time on the project and was 4 years old when we started (now 9 years old).
The only regret I have about the project is not finishing it in time for my father to see it (passed away mid last year ?
Most of all, I wanted thank to thank Grahame and the B&B team for such a great design, and plans which were so accurate and simple to follow. You are a very talented designer.
If anyone is interested in the performance specs with this particular motor setup, let me know and I can post here once the engine has been run-in properly.
Thanks for following the build and anyone who offered advise along the way.
Pic of launch and Yamaha tech, Brunswick River, Australia