I'm going to admit - I'm totally guilty of neglecting my lude, and I feel awful

I bought a practical car in 2013 in preparation for my son's arrival, and my old pride and joy has not really been used since then.
We moved house after my son was born (I bought a house with a double garage specifically with the intention of bringing my lude in and getting her back in good shape), but for one reason or another the garage is still full of junk and my lude has been sat on the drive since we moved in.
Anyway, my son is now 3 and in a normal group 2 car seat, and my job is good enough now that I don't need to moonlight as a graphic designer to boost my income, so I have a bit more free time these days - yay! I'm sick of driving my current car around - so I'm working up a plan to get old Ludey back on the road... but there's a couple of obstacles...
1. The lude has stood for 3 years (ish) so will need a good bit of work doing to get her roadworthy: brakes for starters, and a new battery etc... That's not too bad really, I'm sure I could cope with that. The real problem is that the rust has really started to set in: Both rear arches, sunroof and now the bloody A-pillars! I'm not sure whether they can be fixed, and how much it's likely to set me back. I've been looking online for a possible replacement Prelude, (I've only really fitted coilovers and a couple of little things so easy enough to swap bits over) but haven't seen many good examples for sale out there.
2. I'm tied into a personal contract on my current car till 2019! I just want to get shot of it - it's costing me £270 a month! And by the time the deal is up I'll have forked out another £6500 roughly, so I'm trying to figure out how best to end this deal. Anyone have any experience with getting out of PCP agreements? Even if I pay off the remaining finance (£12k) and sell it on at a £1k loss I'll be better off in 4 months time.
I'd rather spend good money getting my lude up to scratch than waste any more on this damn Toyota.
Just looking for some advice really. I really miss my lude, and I want to show my son the joys of going out in it. It's just been an ornament to him for his whole life so far, and that's just wrong!