If a tie/fo performs an SL does it still complete the maneuver even if it overlaps another ship or does it stay on its current bearing and stops at the other ship?

You don't turn until reaching final position.

So I do turn even though my final position will have me in base contact with another ship?

It works like a k-turn, if you bump another ship, you don't turn around but still gets the stress.

Ok thanks guys.

So I do turn even though my final position will have me in base contact with another ship?

final position is the end of the ruler.

If you obstruct something, you move back the length of the ruler until it fits.

So you don't turn.