It's an interesting one though. The new Fraud Act criminalises the possession of various articles intended to be used in fraud.
I think though, that what he is doing is PROBABLY not at a full enough stage to be illegal though! Immoral yes, and will probably lead to fraud.
Essentially though, he has produced replica service books. These do not relate to any car, and COULD be used legitimately. It would only be when someone bought the book, entered fraudulent details AND THEN attempted to pass off the car as having full MBSH that an offence would have been committed.
Whilst everything else is strongly "Preparatory", it is the same with offensive weapons- Many articles become "offensive" when their holder has the required mens rea, but they are entirely innocent otherwise, and conversely many weapons with clearly only one use can NEVER be innocent.
In the case of items for fraud, something like a "Lebanese Loop" to catch credit cards in ATMS can NEVER have a legitimate use, so is automatically an "Article used in fraud".
However, this one isn't automatically so, until someone buys it with fraudulent intentions....