This past decade, it would have been a 4D/3R/1T map. Given how far left MD-06 and the outer DC suburbs in general moved last cycle, there probably isn't enough there to make a 3rd R district anymore, so it would probably be 5D/2R/1T. MD still has a huge Republican geographical advantage.
It would take a Republican gerrymander to draw a 4D/3R/1T map.
Not really, I can do a map that like that with rectangular districts and 2008 numbers. The tossup seat would be Lean D by 2016, though and the 3rd R district would be close to flipping now.
Would that comply with the VRA? The two GOP seats in the east and west are simple obviously.
After that though you have to go along the western shore of the bay to make a swing/Lean R seat, doing that would probably pack AA voters into a single Prince Georges district, or push the district up too high at least.