Thanks mperdue...

The boot/ trunk panelling is made from MDF (also known as craftwood) and is covered in upholstery vinyl that is very stretchy with the help of a heat gun.

Behind the jack brace (which has been mounted in the factory Datsun location) is the fuel tank and the side walls are simply cosmetic.

Under the floor is the spare wheel, jack, jumper cables, toolkit, spare hoses and even a picnic rug !!! There is also a panel that covers the tail light assemblies. As for covering it up, I prefer the extremely neat and clean look.

I'm assuming you are asking is there are extra speakers in the boot/ trunk. The answer is no. The datsun is my 'shopping trolley' so to speak so I can't justify going all out on it I've saved that for my other car which is below: