Elektron does not make technical drawings or schematics available for any of their products. If you were to obtain one, I’d be cautious about using it as that’s still their proprietary design (although I don’t know how thoroughly they would enforce it).
Some of the older promotional material contained a few concept drawings of the outside, that’s the best I can think of.
Anything else you find will probably be user generated, but I’ve never seen technical (mechanical) drawings or schematics made officially available for any elektron device.