Thanks for the extra information. This seems like a very useful approach (gotta watch my fingers though, cause cutting up a beer can like that leads to razor sharp edges), especially for more complicated scribing operations. I think can handle a simple shape like the wing fuel tanks on my Spit with some Dymo tape though. It seems like you use the drillbits to get the rounded edges, but what do you use to cut the straight lines, just a regular hobby knife or some sort of special knife to cut through metal.
I usually use a sharp needle or the back end of a worn out hobby knife for scribing things, but depending on the situation I run a Tamiya scriber through the panel line as well sometimes