You shouldnt let the money side get to you, and you do right to carry on with the car, versus the usual 'ooh, this has cost me too much money sell it' philosophy.
At present, you have one 'big job' (not even a big bill, really) to sort. For your 6 grand you've got yourself - presumably - 80, 90% the car you want. Go out to any garage forecourt and see what 6 grand can buy you, then see if it gives you electric everything, massive boot, comfort, smooth ride (
what has a smooth ride
these days?? everything's fidgety and 'sporty' to please motoring journalists) knowing this was the very
best Vauxhall could do in the day, and their flagship model.
I wouldnt feel bad about your spending, of course it racks up to criminal levels that will make you/most of us cry, but it always does. Even my Eberneezer Scrooge spending has run into ofour figures in the last year and a bit. But again, don't let it get to you, sort this out, and no doubt a few other niggly jobs and you'll be there. Keep the faith
