Here's a pic of my favorite scratchbuilding weapon.Do you know what it is? Give up? It's a nibler,it is used to make whole in control panels(metal) to install switches and lights and meters.It also works in styrene to cut out door ways and windows. I use this to cut out doorways and windows in any scale I'm working in (as long as the opening is larger than a 1/4". I bought this one from Radio Shack but I understand that Micro-Mark also has them.In fact any store that sells electronics supplies should have them for under 10 bucks.