Just a few things fixing would make it better.
BODY_LR and MR are still the original car it replaces.
You need the GLASS_I object in the interior for interior glass to work.
The dirt mapping is a utter mess and would just be better with it on the body if it's to much work for you.
Fix the position the person seats in as he/she is currently in the seat.
Replace the carbon texture with at least tdu2s as it looks to low quality.
Extrude the bumper and just put a black material on it as it atleast covers the hole.
Getting mirrors working improves the mod imo.
Material setting on the hood needs checking as you don't see it once in the car. Maybe just untick the Alpha Test.
Your Ambient setting is a little to dark on some parts but that may just be my opinion.
Also your Reflection setting seems a little high on some parts again maybe just my opinion.
Only one thing worth saying about the interior and it's that it doesn't fit.
May seem a long list but when you no the basics of modding it's all easy to do. ;)