Styrofoam cooler/chest ok for electronics project?
That box is conceivably suitable - but much less so than many alternatives.


The box is collapsible and not liable to be very strong mechanically. The power supplies are 'not light' and it would require some sort of internal frame to add strength and rigidity 
Cooling with power supplies is liable to be a significant issue. If both inlet and exhaust airflow is not impeded in any way it may be OK but mechanically you are starting to get a pincushion', and any cooling from radiation or convection from the cases would be lost due to the insulation.
Static electricity generation is a potential issue - probably OK, but not certainly so. SE generation would be more likely to occur from rubbing contact with the case exterior. Having to coat or otherwise treat the exterior is not attractive.
You can buy conductive nickel spray intended for screening purposes. I use a very light "whiff" of this on interior surfaces of plastic containers for antistatic purposes. But, on the outsides, it's not pretty.


I'd personally look for something that was mechanically stronger, and ideally somewhat conductive.