I was wondering all the time how did he manage those rive lines. And the answer, of course, is something Gil and others have mentioned a number of times - grandmothers cake-baking tool, made into a jeweler's (and modeler's) dream tool:
It strikes me that the technique for getting that alu finish, the tape (also mentioned by Gil & others), would be even better on card models. It would enable you to fill & sand all glue joints without risking the pattern. Then just tape them over with alu.
But a lot of work, of course. And it kind of defeats the purpose of card modelling, being able to print & paint patterns on parts BEFORE you assemble the model.