OMFG - that R32 is horn city. Sorry it fell through.
Dude , I went permy back in May - so in the same boat, contracting gave me my engine rebuild and that's about it.
Surely, you would have to agree that:
1) If you put your car into a wall on the street, you still have the risk that your insurance Co. won't cover you cause your car is not likely to be standard (ie Insurance null & void), or you were spotted being stupid (ie iF you are charged your insurance could become null and void). Even so - you are putting not only yourself but other pedestrians at risk. Silly stuff.
2) If you are worried about blowing your engine , it must have been modified in the first place (ie $$) so why not keep it stock and not worry about that sort of stuff - Majanal has done nearly 100,000 kms on his R33 - including more track & drift days that all of us put together and it still pulls like a $10 whore.
3) Taxing on the car - only of you let it - look after your car and it will be fine - or if you really want to speed fully hectic bro on the track - get a Suzuki swift GTI (5K ) for your track car and keep your Skyline for the street ( or vice versa)
4) Time off work - you get leave right - plus everyone pulls a few sickies - in addition, there are lots of trackdays on weekends
5) Hidden costs are the same as if you flog your car on the street
Sorry man - like I said, there is no argument for enjoying the track legally versus risking so much (including human life) by racing/speeding on the streets.