75888 Porsche 911 3.3 turbo Cabrio (930 / Year 1987)
Also thinking about how to modify it to the Targa, which also should be pretty easy as the Lego model already uses the "Targa concept" to put the driver in.
Did put the windshield one row more to the front and the 92593 Plate, modified 1 x 4 with 2 studs to the top of the shield. (Maybe it would look even smoother if you put a tile 1 x 4 up there, you could also leave the windshield in the original position and or leave the plate or tile away)
A color change to red also could be nice. Then you have to work on the back with the red plate simulating the backlights. With a second red plate attached to the front instead of the black one and using that one instead of the red one in the back, while replacing the lime one in the back with the black from the front it should work.
Hope you understand what I mean :-D