Oil supply/return for turbo: how without drill pan? and oil-cooler is needed?

[nuvolarossa]

Hi, how can be send the oil from engine to the turbocharger?
And what can be done for return line without drill pan/block?
Do you know how Mosselman kit do this?

Can the return line go to the oil-filler cap with a scavenge pump? And what for supply-line?

With a turbo at 7psi on M4x, is needed a oil cooler?

My car is a E36 M44, so I have the plastic oil filter cover, not the metallic as M42.
thank you