Getting a boathouse approved these days is no small feat.
Sounds like that was a complete rework of an existing dock, they would not permit that if it was an attempt at a new installation. 6' is the normal width allowed.
I don't think the cost of docks has really increased that much since mine was done. We had a 3 finger crib dock 30' long extending from a 6' walkway along shore. With composite decking I think we were about $35k ($7k in composite alone). This allowed our outer slips to be 36' long from shore, not that you can really park your boat that close...
Make sure you have a full 12' width between the posts in the U. Ours was 11'4" between which limited us a bit on bigger boats. Our Monterey had a 10'6" beam, it was a snug fit.
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