Yes, I saw that when I looked at the link. It is a reasonable $7 US for the PDF. It did present a number of points to ponder about the use of a vintage vehicle for daily use. One of the more significant beyond what has been mentioned in this link is the issue of insurance. Most in the US have "old car" insurance, with limited use and a set value. Say daily use would be beyond that, and might even void a claim if nothing is changed when making the jump to regular use.
To assist a bit, the main topics of the article:
How do you intend to use the car as a daily driver, that is, how do you define "daily driver"
Are you willing to accept the wear and tear that comes with increased use?
Accept loss of automotive technology (anti lock, overall maintenance requirements, increased emissions, fuel economy)?
Is it the best approach for daily driving (mainly if you are looking to buy a car for daily use)
Financial considerations, maintenance, parts, fuel
Vintage insurance
Reliability issues (ignition, coolant)
Modifications (electronic ignition, disc brakes, extra cooling fan, fuel pump- new fuels issues)
Safety items (brakes, seat belts, headlights)