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The mad scientist is driven to the fringes to invent something "against god." A monster. To surreptitiously photograph girls by the pool Tichý built a camera out of matchbooks and thread spools. An isolationist spy for his own perversion. A mad scientist's sympathetic intentions, desire, even if their methods are not. You can't take people's parts without asking. The doctor would have required permission from the health department for all that exhumation. That's why you need to build a suspicious backpack. To have a reason for all that gadgety. Build a peephole into the lab. The voyeured corpse stolen from Étant donnés.