Couple of questions regarding V5 etc

[Deanno]

Hi,
Just a quick couple of questions,
Firstly regarding the V5 doc for the car.
As I am using the engine etc from my escort and need to use that to prove the age of engine etc and afterwards scrap the shell.
What do I do regarding the V5 as when the car goes to the scrapyard they usually take the V5 and declare the car as scraped.

Does anybody know what parts of the car I need in order to get an "age related" plate?

I have been told that a "Q" plate is more expensive to insure is that true.

Thanks in advance
Dean