- Where's the jack to jack up the car ?, what jack ? - you extend the undercart to full, place this metal prop here at the side of the car between the doors & lower the undercart (car lowers itself & rolls to one side with underside exposed & propped up side's wheels in the air.

Lovely, that.. makes putting on chains, etc. duck soup
Oh: you could also toss one rear wheel in the trunk (saw demonstrated) and drive around -- with suitable allowance for any hard cornering on the umm missing-wheel side, natch. More re: that great body torsional rigidity and narrower rear track -- it thought it was a Morgan 3-wheeler!

- How do I change the rear tyre ? - here's a handle, now use it to remove the rear-side of the car, over the particular wheel, by undoing this bolt here, now use this part of the crank handle to undo the central wheel locking bolt (wheel falls off)

Ditto

- Why are the front wheels wider apart that the rear wheels ? (never did find out why)

Clever French - the tilting-moment of (heavier + wider) front end + the greatest torsional rigidity of any car then produced, meant - the sucker won't roll because of the skewed rear CG. More nimble.

- Why is the gear box in front of the engine ? - because the drive axles emerge from it to drive the front wheels

- Where are the front wheel's disk brakes ? at the inside end of the wheel drive axles close to the gear box

Masterful stroke re sprung/unsprung weight: as basic a sound engrg. principle as exists re cars. A la various GP carz (models escape - prolly the Great White Cars of Auto Union fame; 'Audi' is a mere shadow if its former Self). Bernd Rsoemeyer and his ilk. (Died in a test car on the new Autobahn :(

- what happens when you accidentaly bang the bottom of a coke bottle against the edge of the front door window when door is open (there is no metal frame around the top half of the door, just the glass) - the window explodes into 1,000s of little square fragments

Same as happens on my also-frameless Acura Plutocrat, if I'm dumb enough to not know where my cocaine bottle is, when I close a door... I Like not having that A-pillar further obscuring the view of surroundings: added by steel frame.

- What happens when you fail to secure the bonnet & drive off at speed ? - the bonnet wraps right over the car obscuring your view & reshaping itself

Has a safety catch - of course, you can defeat Anything. Note that the oval rear cutout prolly means you still can see.

- What happens when a service mechanic fails to tighten the bolts holding one of the front axles to one of the front wheels ? - the bolts slowly fall out one at a time (there are 5 in total) until the last one snaps then the axle flails around ripping out the hydralic lines & collapsing the suspension

About same as happens when you leave out or screw-up almost any vital part of anything.