I remember seeing the model and thinking it looked pretty cool. I remember a member of Congress holding a model up before a General he was questioning and the General saying, "Sir, I can say with all honesty that no such plane exists." This was not too long before the F-117A was revealed.

There aren't many published pictures of HAVE BLUE, but there's one on this page. You have to remember that it was designed in an era when computer power was still pretty limited. Computers weren't powerful enough to compute the radar reflectivity of compound curves like the F-19 or B-2, so they used faceted images. HAVE BLUE and the development of early stealth technology is discussed in Ben Rich's excellent book, "Skunk Works."

You could say that HAVE BLUE and the F-117A are 2nd generation stealth aircraft. First generation stealth existed by accident on the XB-49 Flying Wing jet bomber. They found that it was very difficult to track when it was flying directly towards a radar. Stealth was first used deliberately on the Oxcart/SR-71 to reduce the radar signiture. Rich also discusses that in his book.

3rd generation stealth involved curved surfaces. The first aircraft that I know that used this technology was the incredibly ugly TACIT BLUE, as seen here and here.

The B-2 was optimized for stealth even if that required compromises on other aspects of the design. The F-22 and JSF employs stealth but not at the expense of performance. The evolution of stealth technology continues to the point where we can develop very high performance (and very expensive) aircraft that are also quite stealthy. Their stealth might not be as extreme as the B-2 but they're
more capable as tactical aircraft.