Congrats for sure, hope it lives up to and exceeds all expectations. Great looking rig indeed. The 150 yammies seem a nice engine and once you get them running well you should get decent economy if that worries you at all.
My first experience on a Cat after 30 years on monos was indeed a bit disturbing, big swell on the day off Mooloolaba and the skipper (also inexperienced with Cats) almost rolled it, a 9.0M KC. Anyway I got behind the wheel a lot after that with various rigs and once I sorted out their good and bad habits, got to like them although still a scary in the hands of a novice skipper.
If I had the cash to buy and run one I would be tempted join the club too. Hope to see you on the water, I'll be in that tinnie you just few past...