Though I have sailed, I am NOT a sailor. Though I have built many things, I am NOT a boat builder.  I most certainly am not a boat designer.  I have read rather widely on all 3 subjects for several years.  The pros and old hats are often over my head, though I still try to follow along.  But the absolute most edifying reads for myself have been to follow along with amateurs as they navigate the complex decision making matrix on various blogs and sites.  For that reason I strongly thank you for sharing your journey.  The decisions you make, the reasoning behind them, and the advice others give is the type of information that provides the highest value to me.

Given all that, why the absolute limit on length over all?  If it has been stated plainly, I apologize but ask if maybe you could restate it.  Yes, the fanboy in me could say "But but but, harryproa solves all that, blablabla".  I think we have all read plenty of that.  Besides, I'm no expert, and don't REALLY know it is true.  So I wouldn't dare make such suggestions to you, building your boat, for your reasons.  But it would be invaluable to me to understand your thinking.

Some of the most cited drawbacks to length dont seem to be of a concern to you.  Absolute length brings higher marina fees and issues with maneuverability in tight marinas or trailering etc. On other boat designs it may be visibility over the bridgedeck, or simply too much boat or too much complexity to single hand (say a 50' cat vs. a 30').  Or certainly cost, when constrained to a particular design length certainly adds materials which adds cost.  Even if it is simply, to get the extra length for no more weight/cost you would have to build an HP and you simply dont trust them as much as the more proven cats, you certainly wont offend me and I'd like to hear it if that is the case.

I wanted to make a long intro because I imagine you may feel a bit hounded.  Almost every question as to why the hard length limit has included an argument for why it is not valid.  You will not get such argument from me, as certainly you know best for your boat.  But I would like to know if I have overlooked the same reasoning for MY boat.  We may one day be living similar lives in the same anchorage.  I'd rather find out now than over a coffee or rum in Ketchikan in June 2021.

I fully expect whatever your reasons that others will tow the party line and suggest how a HP solves your concerns.  You may find that annoying, but I will read them with interest, this is after all a HP forum.  But a dedicated catamaran builder applying intelligent infusion and novel thinking is an assett to all of us if you can just grin and bear it.

Cheers

Jeff