Dept of Sneaky Tricks

[sherpa_jones]

Begin by drawing your exterior walls. Select the wall that you want to slope and make it invisible. Draw a roof plane over this wall and drag the overhang to where the baseline starts. In the roof DBX, your baseline and fascia height should now be the same. Lock the pitch and adjust your baseline to the bottom of the wall, usually 0. Lock the baseline and adjust pitch to degrees, and enter 80 degrees. Enter the rafter depth you will require; note this is your wall stud depth.

Set the following in the roof dbx:
-square cut
-no boxed eaves, soffits, gutter
-no fascia, sub fascia, no trim to soffits
-materials you want

In a camera view, adjust the ridge height to match your wall height. This can be verified in the roof dbx.

Create a 3d symbol of your window in another plan by following Allen's steps in post #16 of this thread. Make sure the wall you use in this step represents the same thickness as your roof plane.

Import the 3d symbol into your plan. Open the symbol and rotate the x axis to match the slope of your wall. Move the symbol into position so the casing on each side appears to sit against the roof/ceiling surfaces. You may need to get creative to get the right positioning.

In camera view, draw a skylight inside the window and change it to a roof opening. Stretch the boundaries of the opening until they are hidden in the window casing.

Draw an invisible wall along the ridge of the roof plane. With the new room definition, remove the ceiling.

That is it!