I gotta be honest.. I was half about to ask if you were going to bump the roof up. Didn't want to cause you grief buuuuuuuut.. it is one of the characteristics that make it a hearse. Maybe bumping up the D pillar to give the angle is enough to pull it off?
After looking at the pictures of that one, I think the reason for the door opening that way would be for safely loading without having to navigate around the door. On a model though I don't really see a problem having it open either way.