Ok , this on the fly with what little I can remember and thus is operating on a few assumptions that may well be erroneous.
Ok as you approach the speed of light your mass increases exponentially till at the speed of light your mass about infinite (pick any infinity you want) .
We know that Sufficiently massive objects have a Schwarzschild-Radius beyond their physical bounds and thus no light can escape beyond the event horizon.
Also sufficiently massive bodies will cause gravitational lesing of the objects on the far side of the at C craft: relative to the observer.
So for a craft where it’s speed is >=C you wouldn’t see the ship at all, but an area of distorted space as if a huge fuzzy lens was stretched out through space.
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