Well, for my taste far too much useless weight aboard. Why would you want the backseats in a racecar - especially when you have a rollcage. The passenger seat is also just useless weight during the race, so is the whole interiour design - you don't need that in a proper racer. A german team recently finished their 1 series coupe based hill climbing race car. I mean - I don't know the regulations you need to have an eye on, but for me this isn't a serious race car. It tries to be both - all day driver and race car at once but by trying that it fails doing both.
If you're interested you can have a look at that project. The texts are all in german, but the pictures actually give you a very good impression:
134 Judd