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You could use the sideboard and base board, but It would be uncomfortable and also a tight fit. The box use is significantly wider than the bike giving more space. It has a bench seat. Usually there's blankets in there to make it cozy. No canopy.
It is a fantastic cargo box that you can really abuse. I regularly use it for terrible things such as bricks, sand, firewood, garden and yard waste.
The sides come off and it becomes a flat bed.
I've posted ad nauseum on here about it.
They'd fit, not cramped but definitely snug. The kiddos would have to cooperate. You'd struggle to fit much beyond a soccer ball in it at the time, unless the 2 year old agreed to squeezing in.