You guys are having all the fun in t
he Lycée du Val de Lys, would have loved a project like that when I was in the Lycée!
is it the part hanging out that you are consulting about? I would think it is just an accessory probably made by a third party, and attached with 6 screws....
I am not sure what structural factors are involved, hopefully somebody has a legacy document to put you on the right track.