Here's an answer, probably not the one you want to hear.

The P-38 was designed with counterrotating props. The first order was made by the British, who specified identical engines both turning the same way (without turbochargers, too.) After some wind tunnel work, the counterrotating engines were switched from side to side, so the prop turns away from the top of the canopy, rather than toward it. You could build a scale, correct engine rotation P-38 in any of those configurations.

I understand the ordinary full scale twin has props that turn toward the canopy on top.

Twinman has addressed the counterrotating question at length, in a thread on the twins forum. I'll let you do the search. You'll find there that some will spend the money to have correctly counterrotating engines, and some won't. One of the high dollar items is the reverse pitch propellor, for the left-hand-rotation engine.

Good luck
Dave Olson