I'll play devil's advocate.
$11k is what I call a cheap 300Tdi Defender and it sounds like it's been used and not terribly well maintained to me, hence the easy to fix engine leaks, fubar ball joints and leaking swivels.
With 270k kms on it, it will soon be needing big end bearings.
The gearbox can only leak from a few spots usually a box out job to fix.
TC if it's leaking from the input seal is a box out job to fix.
If you are pulling both boxes out it's probably sensible to consider a rebuild with 270k on the clock and a new clutch, slave, master, fork etc.
Water pump housing will be the P-gasket. Cheap fix but involves a bit of time.
Possible swivel hub rebuilds on the cards (you have to take them off to do the seals). CVs aren't badly priced so you do those at the same time.
Rear diff will be a Salisbury. Changing the pinion seal should be easy but can potentially be difficult and if not done correctly can get expensive.
I'd be taking a keen interest in what the report showed regarding rust.
I'd also want to know when the head / head gasket was last done and the radiator rodded.
Same with timing belt.
All 300Tdi issues that will cost you, because if you don't know when they were done, or they were done a long time ago, they'll need to be done again.
I'd expect to spend quite a lot of money on an $11k Defender to return it to top condition and not have to worry about it letting you down. But it depends what your plans/expectations/reasons for buying one are.
Here is a buyer's guide that covers the 300Tdi - 
The Ultimate Land Rover Defender Buyers Guide | Loaded 4X4 
			
		
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