S.G.
You don't say how old the girls are, but what about making a side with heavy duty canvas and heavy duty velcro. You could put the velcro along the bottom of the bed (the soft side of velcro) and along the walls. Then the sticky side of the velcro on the canvas, where you can put it together, making a crib out of the table area. I would take the play and pack anyway if they are young, it will be a good way of keeping them safe outside.