Bench seat in back SR5.4
6 round a bay will be fine, or sheltered waters, but you wouldn't want to venture far really unless flat calm.
The RC 585 would be much better or a 5.8m Humber Destroyer. They both have a high sheer bow that'll lessen the splash over the front and a higher freeboard at the transom, lessening waves over the rear at rest.
They're also wide enough for side by side jockeys.
The seariders are known for always having a wet deck! Fine if playing about with kids and toys, annoying if in transit or fishing.
£££ determines most things though.