WRT to a cooler jump-seat in a direct drive, my 6 year old son loves 'his spot' behind the driver on the "cooler-seat".
- Igloo 54 qt Marine Elite Cooler (stainless latch)
- Igloo Cushion for 54 quart permanently attached to lid.
- Probably not needed, but I do it anyway, non-skid cooler mat under the cooler (has never moved with that).
With the cooler tucked against the gunwale (??/side) and back of driver's seat, he just using either of those as his backrest.
I don't have a picture of the combination behind the drivers seat, but here's the two parts.