Can you pm me your brake recommendations, I'd find it interesting to see what you consider the best options.
Okay, so Ferodo DS2500 - £177 p/set (demon tweeks)
I reckon you can lose at least 100k's with seats, inner trim, headlining, boot trim, plastic stuff, some of the centre tunnel and all sound deadening. Especially if you then remove aircon, fit a raceweight battery (£170, driftworks Braille battery) and cut excess brackets out from rear of car and engine bay. If you're really intense, you can single-skin the bonnet too, and possibly remove some metal from the boot. I suspect the front and rear bumper bars can be removed/trimmed too.
Do you not agree?
Don't believe you with the engine - especially after what others have said. Service car - oil, plugs, filters before 1st track day. Change oil every trackday or two from there on, and make sure it's correctly circulated every time you do an oil change (a mate made a mistake with this and killed his shells once, I'm never doing the same!), warm up and cool the engine down properly, then I suspect it'll last pretty well.
R888's are £190 p/tyre on Camskill upto 235 17" and 18". A 235 R888 = pretty frigging sticky!
Add the price of a pop charger and a 2nd hand exhaust (or £100 for say, longlife to create a decat pipe (because I have a mate who works for them).
I agree there're better track cars out there, but I know Booner, so it's more a case of picking something he likes, and is practical (to a degree).