[sc_rufctr]

Converting a Targa to a convertible is pretty straight forward.
I even remember seeing a Porsche technical bulletin on how to do this.

To go from a Traga to a coupe would require way more parts and time.
It's doable but you should ask your self why.

Wouldn't it be easier to make sure your Targa roof is adjusted and fitted properly and enjoy the car.

Often owners are swayed by the opinion of others about their cars.
The Targa is a great car. Don't let anybody else tell you otherwise.