It looks like you could use the slant of your console tops as a guide. I don't think they absolutely have to be curved to get the same effect -- you could probably get away with using the same angle as your console tops as the angle for the cut-out hood of the door.
By all means -- use the angles you've already figured out. It took me forever to figure out the 22.5 degree angle. I made a foamcore model of the doorway to help me visualize how to make it -- it might be useful for you to do something similar if you have the time.
And do you have any pics online of your model set that you used cups for the chairs? I'd love to see it!