a targa top or sport roof is just a removable one piece roof....
like t-tops without the center brace,.. they can be glass or metal..
I got an install price (for glass roof) of $12,000 cdn.. which is more than my camaro is worth..
My supra has one and I love it, but its not worth doing to a vehicle that doesnt have it.. That supra weighs over 4000lbs (more than some trucks) because of the added support and extra weight of the frame..