I agree with Japster Shaun.
Take a break, step back and close the garage door on it for a few weeks, you'll be amazed how quickly the 'need for speed' will return. i was in the same situation, spent all winter frigging around with the car, missed the start of the season by 3 months and was ready to '4 star and a match' the bloody thing, had a break and im mega up for it now.
Dont throw in the towel Big Guy, your previous car was an inspiration to many people including myself, be great to see S13 eater become 'Maclaren F1 eater'
as has been said before its helluva lot harder to be a pioneer and innovator than follow a well trodden path.
Maybe if we hide your car and only let you have it back when you promise to finish it with no less than 750hp?