Going the salvage titled Model S route is, from the accounts I've seen (likely featuring the same videos from YouTube), is thoroughly unsupported by Tesla, to the point that Tesla will refuse to sell parts to people if Tesla knows they are trying to rebuild vehicles that have a salvage title.

There's making parts "more freely available" and then there's "you can't have this from us, for any price". Fortunately the ludicrous amount of power in the Model S and people's inability to control the car (or themselves) means there's a good sized underground market of salvaged Model S' bodies and parts, even if there's no office service manual available to amateurs.

Meanwhile, Chevrolet will just sell you the engine from a corvette in a crate. (Okay, it's ~$12k, but they're willing to do it.)

I say this as someone with a Model 3 reservation, mind you. Tesla wants to build the iPhones of the electric car industry - no user-serviceable components inside, and the battery isn't removable by us mere mortals who don't work at Tesla. (Abandoned battery replacement tech demos from a few years ago aside.)