It is a fascinating subject. ICE cars also used to separate platform and body. Coach builders might have been completely separate ones from the rolling chassis

It is a fascinating subject. ICE cars also used to separate platform and body. Coach builders might have been completely separate ones from the rolling chassis makers. Monocoque construction made that harder. Engines might have been one cylinder side valve arrangements. Electric starters only came around after 1910 or so. Compression ratios and temperatures were low. Cars only had a few gears. Closer to a pull start lawn mower technologically than a Tesla.