I've recently gone and bought my self an Audi RS6 2003 Saloon (87k on the clock), in grey, with "lotus"

The RS6 engine starts, gearbox seems to work backwards and forwards. I think the car was taken for a joyride, the result of which, it has a ding to the lower front grill, which appears to have damaged some sort of radiator (smaller one towards the bottom in font of the bigger radiator), now I've been looking at the forum for a few days and I think it may be the oil cooler. I just want some advice on repairing this? Is it a specialist job or can any mechanic fix this? Does anyone know where to get the part too and the correct part number? Now obviously this cooling item has been broken so I'm just wondering if it could have had a "domino" type of knock on effect to any of the other bigger bits?
My main concern is whether the head has gone on the engine, are there any obvious tell tell ways to check this as well as other components on the car? Besides a compression test. Obviously i'm quite excited and i want to know, each night i lay in bed thinking about it!! I'm waiting for my local garage to take it in.
I've got a very quick video of the car running, with a few slight throttle blips (inside), it doesn't sound too bad considering it's not been started in a few years and idles fine, maybe that will give more indication of whether there's issue or not?
I think the rear passenger side calliper has ceased too, so if anyone's got one, I need to buy one.
I know there's a lot of work involved here but i'm excited and i'm sure the end result will be well worth it.
Audi>Bmw