There is still a difference between e.g. Lada 2104 which, while admittedly having some strange fastening designs, was relatively straight-forward do (partially) disassemble and reassemble, and e.g. modern Fords where you can't to take the lights off of your trunk door without fully disassembling it first. Even better, the exact jigsaw puzzle of the design varies from one modification/year to another even for what is supposedly the same car model.