Have 92 C2 Targa.
Had the full monty refurb done by Cars Inc. in 2002. Was about ~ $900 at the time.
Targa Top Restoration.
VERY pleased with their work and end result. Very tight, windows seal well, no leaks, "quieter" than before refurb (can't compare to coupe), and looks great.
Store it in front sometimes; other times put in the rear seat area.
Cheers, Obbie