I'm using this Rhino Containment Vessel as a sump for my large aquarium and I need to be able to bond hdpe sheets to the sides of the tank to make shelves. The tank itself has a textured side, so I know I might need to do some sort of fiberglassing? Only an example, not sure if fiberglassing would be the way to go in this situation, but do you guys have any ideas?

Thanks