[dsraven]

not sure how it works where you are but in Canada things would get ugly quick if you were caught stamping your own vin plate and attaching it. heck, even if your old vin plate simply fell off and you screwed or rivetted it back on they could seize the truck and audit the crap outta you.
I suggest to casually chat with a local builder, the local authority (police) or the dept motor vehicles. get it right the first time so there is no issues after you spend a whack of time and money on it.