Seems like the classic issue when a house isn't stripped of too many personal touches prior to a sale.
Aside from the obvious other potential negative selling point issue of mimicking, possibly counterfeiting a government vehicle, your concept is fine for somebody wanting that type of thing, but seems very limiting to a wider pool of potential buyers.
A nice job for you, but if I'm the guy paying for it on speculation it will help sell the boat, I'd just as soon put a little of the money into a good detail job and then lower the price. That's just me, I'm just really practical.