[rohrmann]

Absolutely do not cut into the belly coroplast. You will just be making more work for yourself and as was said, you risk unknown damage to hydraulic and electric that will be laying on the coroplast. They build these rigs upside down when installing things in the belly, then flip it over, hoping to never see it again. This is a photo of all the hydraulics and electric that had been laying on the coroplast and ultimately ended up hanging way down once the coroplast was removed. I installed hangers and cable tied all this up prior to repairing a crack in the grey tank.