here is my plug for riveted boats...

they are usually made from a lighter gage aluminum and dont require as much HP for the same speeds. also they are typically flatter bottom and have a bit more room than welded boats... but being flatter bottom they don't ride as well in heavier water...

I've had 2 boats in the last 20 years. A 12' welded late 1970's kalamath, and a 14' riveted 1967 hewscraft... I used them both for the same things that you describe. I sold the Klamath and kept the hewescraft...

the klamath rode circles around the hewes, but I was willing to sacrifice ride comfort for fishing room and lightweight. it hauls ass with a 15hp motor and has a ton of room for 3 fishermen. I prefer the lighter weight especially in the canal were there are not a lot of boat ramps. Multiple times a year I'll drop it on the road and slide it down an embankment to launch it (shrimp season when the launch line is a mile long and estuaries where there isn't a launch). it is easy for two guys to push up the bank to load as well...