That ducktail is awesome man. Would absolutely love one on mine, but I'm not nearly brave enough to sculpt it like you did. Would probably be close to a grand to have a paint shop do that one if they would even fit it on. Would still be cheaper/more practical than the original sport package spoiler though.
Pro tip dude duckbill yo can sand the trunk and the spoiler and panel bond which will fill the gaps and then it will be permanently bonded and you can do the body work with fiberglass filler then standard filler then glaze
This may be an old comment but I'm always surprised whenever I see ppl raggin or questioning why someone would do something to their car. But i see this the most in the mk3 supra community. Like if you do anything to the body that isn't stock you're committing sacrilege or something.