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You can see all the little pieces separating, the old styrofoam is deteriorating. Clogging up limber holes and possibly a bilge pump in the future, I'd ditch it for some new closed cell foam.
Guess I should rephrase that from just boat to boat and loadout. All decked out for fishing it would be heavy for a 70 with his boats loadout.
Specs...
https://starcraftmarine.com/model/166-dc/
I have a 115 Merc 4 cyl on my 18' SS and it weights in around 400 lbs. Although the V5 variant does have double knee braces with a very robust splashwell. The splashwell drain holes are still low like any other model with a 15" transom. Water does come in sometimes when launching on steep ramps...
1100F which is pure soft aluminum and 2117T4 which is a strong alloy. The hull AL material is 5052 alloy. I would not recommend using 1100F pure soft AL on structural components such as the ribs.