For anyone building a feral cat shelter out of a plastic tote , I experimented with a dozen tools, and if you happen to have a Dremmel oscillating tool, it cuts through the plastic like butter. I found a pallet and cut it to size to anchor it, and rather than screwing the tote to the pallet, afraid that movement might crack the plastic, I tied the tote to the pallet. I can untie the rope when I need to add foam insulation and straw.