It is worth a reminder, for those who dislike flattening waterstones, of the Spyderco range. Think of these as the oilstones of the waterstone world....
Given that the average daily drive is about 50 miles and you can get 50 miles range in about 12 hours with a level 1 charger, then a level 1 charger...
Something I have done before is use one of those 1/8" engraving bits (cheap on eBay) to mark outlines, screw locations, etc. Even a 0.005" or 0.010"...
The whole state of South Australia was the prototype for large scale battery use and Musk supplied it as part of a bet IIRC or some sort of deadline...