I wouldn't say that the cost of the parts would be a major problem.
a set of rings for a 240D ...$138.59
main bearing set $ 63.44
valve guides $ 13.63
gasket set $ 53.21
cylinder sleeves $32.00 each.

The labor would be the most costly element., I would think.

maybe I left something out.
These are Fast Lane's prices.

I'm pretty sure that parts for a humble Nissan would cost more than this.

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Semibodacious Transmogrifications a Specialty

1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)

"Time flies like and arrow, yet fruit flies like a banana"
---Marx (Groucho)