The airframe's shape doesn't bother me in the least.
1. Look at modern stealth aircraft. They are rounded, blended, and generally lack a vertical empennage. When they have one the angles aren't conventional.
2. It is a conceptual drawing. Everyone thought the "F-19" would be this flying teardrop thing until the F-117 finally saw the light of day (almost literally).
3. The B-2's design is 30 years old or thereabouts. That includes construction methods and materials. We haven't learned anything about the design in that time, there was no more data to wring out? Look at the F-15 Silent Eagle, a gazillion year old (by today's standards) design updated with stealthy characteristics, including design and materials.
4. If the thing came in 10% late and 10% over budget while meeting it's performance goals/ specs I would be elated. It will have managed to do everything the F-35 can't and won't at that point.
I don't care if they paint a potato black as long as it kills people in creative ways and never shows up on radar.