Lupo 1.2TDI Engine: Complete Disassembly Guide

Hi.

I have a 3L Lupo in the workshop, and it's making extremely loud clattering noises.
Is it possible to disassemble the ANY 3-cylinder engine without destroying it? I read somewhere in a VW SSP document about this engine that it has aluminum bearing caps that warp when the head bolts or nuts are loosened, and that the engine then has to be scrapped. Furthermore, the engine is supposed to have dowel pins that run from the cylinder head to the main bearing caps.
Most likely, either the piston pin boss has broken off in the engine, or there is damage to the connecting rod bearing.
The mileage is only 102,000 km.
Is it worth the effort to disassemble the engine, or would it be better to just get a replacement engine block?
Sure, here's the translation:

"Thank you in advance."

I've already read through that.

/viewtopic.php?t=18201

It basically contains everything you need to know.