If you are using the rules for using Epic ships as obstacles and Dash decides to fly through an Epic ship can he? I would think that he can based on the wording of his card.
Would you just mark where the ship was, pull it from the table, and then have Dash finish his activation?
What if he didn't clear it? Since he no longer is immune to the effect of obstacles would he essentially get bumped back through the way he came at the start of the Combat phase or would he spend the Combat phase overlapping the ship?