Standing headroom means more windage and / or more slamming because there's not enough clearance between the bridgedeck and the
water.
I'm 6' 2". In my Iroquois I could stand in the hulls but was on hands and knees in the
saloon or waddling between hulls in an undignified and highlu unflattering crouch. It was a delightful
boat to sail and I could bring her alongside in most conditions using a
single (steerable)
outboard.
The Piana 30, my
current boat, has standing headroom through most of the hulls, stooping headroom in the saloon walkway and sitting headroom at the table. It does snag the incautious toe on the bulkheads though. It is a fun boat to sail, a bit more windage than the Iroquois, a lot faster, but despite twin outboards it's more of a handful to
dock in tight quarters.
My next boat, the PF Lucia, has standing headroom throughout. It has a lot more windage. It also has two big inboard
diesel engines. That might be enough but some folks have gone as far as fitting bowthrusters on big windage cats. It will cost a lot ore in the Marina and to
lift in/out.
The cost of comfort is extraordinary. The next boat will finish up costing thirty times more than the Iroquois. It's a lot. In his book "Multihull Voyaging" Tom Firth Jones stated that the only time he needed standing headroom was when he put his trousers on.
Were I not planning on enjoying the company of guests that expect more comfort and the ability to walk from
hull to
hull as if they were in a
hotel I'd probably update the
current boat. I did consider keeping the one I have and chartering a bigger cat when friends and
family came to call. Still might! :-)
So: - If you want the freedom to walk about your boat without ducking your
head be prepared to spend a lot of
money unless you are either prepared to seriously compromise on handling or performance.