Welcome.
Rule 1 - multiply your worst cast cost estimate by 2 or 3.
Rule 2 - double the time estimate (triple if you only double the cost estimate)
Rule 3 - What you can do with a grinder in 5 minutes takes at least 5 hours to replace (sometimes over 25

).
I am not sure why you would lower your deck because it will no longer self bail. When I lived in Oregon it rained a bit - not self bailing is sometimes an issue in the rain. North Pacific is a bigger issue. Twins an extra foot off the back are probably ok with std deck height but sure are not raising the freeboard (&deck line) aft.
Quote:
Originally Posted by DyeHard
Replace the floor and lower it 4".
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And 4" will mean that you get to cut the tops off of the stringers and replace your fuel tank - likely with a much smaller one. I think that is also lower than the chine line on the 23.
The rest of the ideas are interesting - some are a whole lot of work - take a very close look at how everything is built and figure out all the steps to re-do it before you start cutting.
Good Luck.