Okay, well you can't make a stealthy fighter that matches the current junker line. The description of the bulldog seems to lend credence to it being a madmans design. Some drug crazed junker. As long as it is junker colors, I think it would fit in.
See, from people who are not junker I've heard those are the things that need changed. Dark textures blend in with the environment, people consider it to be sort of an exploit. Because it is hard to see your target.
That's the whole point of the stealth shooter concept. In terms of stats, it's not an amazing fighter, but it's model gives it an edge. The stealth element doesn't make it OP, but it does make it unique to other fighters.