I like the conversion except for the "spike" on it's forehead. That looks a little to awkward for me.
Taking the longer outer tentacles and moving them out to the wings, though, is inspired and certainly changes the menace factor for the ship.
If I hadn't already built all 6 Shadow Scouts (twice), and like the idea of swapping ships out as needed, I would consider a conversion like that for the Stalker.
Good work, overall, though.
-Ken