Is it possible using a desktop printer to print directly on a sheet of very thin, say .005" styrene? The stock is thin enough to be used in at least some printers but I'm concerned about possible heat and whether the image will be permanent or if it would be susceptible to smudging.
What kind of printing? For inkjets, it's possible, but the styrene must be coated with a chemical to prevent the ink from beading up and to promote adhesion. That's why overhead sheets made for inkjets are often only printable on one side.
The fuser in laserjets is indeed too hot for styrene, and would melt it instantly and ruin the printer. There are high-temperature plastics made to survive in laserjets, but I don't know how useful they'd be in modeling.