Use ids to show what has failed, fix the appropriate items and clear the rcm crash data, do the ignition sequence to reset the fuel pump shut off, mine told me what to do iirc, maybe brake and ignition on off a few times or something.
Don't know about the cmax airbag tbh, maybe check part numbers? Also if you think about changing the whole wheel consider the buttons /steering control module might not be interchangeable and need programming. Not something I've done but worth being aware of.
I did my 65 plate custom when I got it 2 years ago.
I had front damage and I needed to replace both seatbelts and both front airbags but that's all. I think there is a front crash sensor behind the grill near the centre but mine wasn't that damaged there. But if you get a fault code for your front sensor then replace it/damaged wires.
No curtain airbags or anything on my van although there seems to be a configuration option with a few configurations
56 350 2.2 130ps mk7 with 2 side doors
65 290 2.2 125ps custom with 2 side doors
07 350 170ps
Ids v86 licence + v86.04 update + xprog
hereIds map
here