I'm getting ready to add another air conditioning vent beside the radio
on my Vanagon and I wondered what tool would be best for cutting a
square hole in the metal dashboard.  Has anyone cut this metal and what
tools did you use?  I don't have the room for a saw because the heater
and other things are in the way.  Has anyone used a hand metal nibbler,
like is used for modding computer cases, to cut this gauge metal?  What
other tools would be appropriate?