I too have kicked this idea around in my head. I'm sure you have given it much thought (e.g. weight and durability). I would think that from an ease of application standpoint, litho plate would be rather labor intensive. If you plan to scale model and replicate real panels and rivets, it would take very precise cuts. Compound curves as encountered in transitioning wing root to fuselage would involve a lot of trial and error, not to mention the patience of Job. I have not seen anything pertaining to this construction method anywhere else.

I'd like to hear your thoughts and if you have a model you'd like to try it on. I'm going to do a search on the scratch-built section of RCU, just for grins.

Good Luck