This seems like burning too many calories to get into that can. Try rubbing the rolled edge rapidly over a semi smooth concrete or medium rock surface. The rolled part is relatively thin and the lid will pop off easily. Not to mention, if this is a zombie survival tip, perhaps you should touch on the fact that with your method one needs to be careful of the sharp jagged edges you've created. If you like, I could give an example.
This would be perfect as an off-grid home. Bank of batteries, Wind turbine, solar panels, find a local creek for hydro and you're in serious business. In an emergency scenario you could even use a disel or propane converted generator. A nice wood boiler for hot water and heat and booya! :) Though I woulkd trade out the 2x6 floor joists for at least 2x10s. :)