I've already replied via PM to the owner my opinion on the car
and a 'rough' guesstimate' on what it could cost to fix everything.
TBH, it really depends on whether one would be happy to have/keep
it after it has been fixed.
1/ The rear impact damage in my eyes is not really a 'show stopper',
and the rest could be fixed relatively cheaply...if one could
& did do a fair bit oneself, but if you're not mechanically inclined
then it would cost to get someone else to do the bits.
2/ Exhaust...get a quote from a good exhaust place (not KiwkFit)
for a 1.3 Colt, 2005, 5 door...or...buy the parts on ebay
from upwards of around £195 (incl catalytic converter)
and find someone to remove the old and fit the new system.
3/ Tyres are easy and cheap to source...www.blackcircles.com
4/ Rear wheel bearing...not that much to buy...or fix...or expensive to
have it replaced.
5/ Discs and pads..again, bargains can be found on ebay....as I found
out when I got Ferodo one's for my daughters AND my ex wifes
ForFour's quite recently. I think about £65 for the fronts. I did them,
but if you paid someone to do it...1 hour to do them, so say £70 or
so labour cost.
6/ Rear axle bushes...They're not completely knackered...yet, and as
the car currently has an MoT, then I would be inclined to leave
having the beam axle replaced till near the time of the next MoT.
PS: you cannot get new bushes from MB/Smart. You have to buy
the rear beam axle with the new bushes in it. You can however
get 'aftermarket' replacement poly bushes. They are harder
and will transmit more road noise, but they take a lot of work
to fit, and at £120 a pair + 3 to 4hrs labour to remove the old
bushes and fit the new poly bushes works out just as expensive
or maybe more so than getting a new rear beam axle from
MB/Smart and having it fitted !
So there you have it.....
It's worth arguing for a refund of a lump sum of something close to £800
to cover the items (and labour cost) that need fixing and then getting it
all done...OR go for a total complete refund.
It really is down to the individual...and what they'll be happiest with.