well for a start you need a suitable OBD reader to find out which black box to throw away.........thankfully brakes and suspension components are still fixable with spanners and brute force.
Rust is still a bit of a twat though - care has to be taken to check what lies beneath - scrapped my wife's Hyundai in December - 56 reg low miles nice shiny silver body work - MOT revealed it was rotten as an over ripe pear underneath. Neighbour had similar with an albeit much higher mileage Corsa - looked sound but nearly fell in half when a garage raised it on a 2 post lift to look underneath