When I first started looking at catamarans, about 6 years ago, I looked at the 45-48 foot range. I ventured on one and tried to imagine myself single
handing it. NO WAY!!!! TOO BIG. I said single hand because you never know when one of you may be temporarily incapacitated, unavailable, etc... For me, conceptually, it was just too much boat. Have you had the oppurtunity to board a cat that large? What was your impression. Imagine handling it when one of you is down with a bout of sea malaise.
After a having a cat for a while now, some refinements of my impression. The issue is probably not one of handling, per se, the biggest issues are maintaining it. With the larger boats, there is SO much more to maintain, and the systems are more critical. If my electric
wench dosen't work, no big deal. Use the handle. Not so with a 50+ footer. You have fewer options, and pretty much need all those mechanical conviences to manage the boat.
The length is not the factor that is going to cause you the most challenges, width will be a major issue. I imagine you are going to have a beam of at least 26 feet. This will make many marinas
unpalatable for you. You will only be able to be hauled on the big boy lifts (200 ton!) so finding a yard to haul out
will be a challenge.
At sea, I think you'd love it. As long as all systems are functioning correctly. I think the tracking and handling of seas would be great.
The maintanance would be SIGNIFICANT. Count on things like a set of sail costing $30k or MORE. Anchors and rode
are going to be expensive. Bottom painting is going to be $$$. When they said 10% a year for maintanance they were speaking of boats that size. So, if you could find a cat that large, for under 1 million, you'd still want to budget like 50k-100k maintenance per year.
I'd look at something in the 45 - 48 foot range as the tops. These boats will be VERY large and will take a while before you are completely comfortable running and maintaining them. And, boy are the large!!