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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.
Could be the flaw in the plan
Do you have to do the canopy, or can you do sideboards, baseboard and seat with kids?