It is an illusion that the walls are pure foam.
In every box I've ever worked the panels arrive as wood framed elements: polyurethane foam as a core with edges of wood and a surface layer of metal -- thin stainless steel approved for food service.
So you use the wood as support -- the foam won't hold any weight to speak of.
If the raceway is overhead you may have to bolt j-hooks clean through to the topside. It all depends on how much weight you have to hang.
It also sounds like you'll be mounting explosion proof jelly jars -- the ones used at refineries. Talk about $$$$.
