Too many people think that their cars are - and ever will be - just as they are sitting on the driveway. I prefer to see them as a collection of parts, some harder to remove than others, some more essential than others.
My sportscar for example has a luggage rack that can be fitted or removed as the need arises. It also has a windscreen and wipers, but if the weather is good and you want better straight line speed, they can be removed. I have recently put some effort into making it easier to deal with the electrical connections when you take the windscreen on and off.
I am now also the _proud_ owner of a Fiat Panda. While it is eminently suitable for driving my elderly mother around in it hasn't got enough interior space to either take a p.a. to a gig or take a broken up shed to the tip. In order to reconfigure it as a goods vehicle I have got pretty good at taking the seats out (except the driver's seat - that's on the minimum equipment list) and I am currently making a ply liner for the area where the rear seat usually goes.
Richard "Jury Rigged Van" B