How much are we talking roughly to do the chassis, drive, and cooling upgrades roughly are we talking £1000 ? £2000?? M
Rough numbers:
Centra probably around £1k for parts and same again for dealer fitting.
Cooling kit around £150 for parts and an hour or 2 dealer labour
Chassis brace (for pre 2014) should have been fitted under warranty and if not will be.
NVH kit (for bevel box) don't bother with as it doesn't help and makes access to the BB difficult
If it still has the ally rear sprocket it's likely to need changing to steel (or supermax) at around £500.
If buying from a dealer they should be able to do a deal on any upgrades needed.