Looks awesome mate!
The design;
I believe that the Design you've made it yummy ! you have been able to mix a JDM style along with a timeattack look! so great job there!
The Job ;
You have placed everything quite well however it lacks some quality here and there!
i wish you would have rebrushed the Front bumper as it lacks quality and is very noisy imo,
Also the new roof could also use a rebrush/or smudged it so the quality would have gotten better!
Also the front bumper seems to be somewhat off, i think it should have been moved to left a bit.
The rims also looks good! The rear wheel looks good, and the style of the rims fit the style of the car!
However i believe that the front wheel is way to big, as almost half of the wheel is behind the Front arch i don't think you would be able to turn it outwards

So fix that and it will look alot better!
I also would have wished that you made the Rearbumper lower, as it would be more symmetrical and look better !
But a great chop, just needs some improvements!
//NiBs