>> Does anyone know how to draw a proper window alcove or a set-in window? <<

If you don't require a brick mould around the window frame on the exterior, then just set the trim width to 1/16". Not perfect by any means, but the simplest, and as close as you can get with available Punch controls.

If you DO require an exterior trim, then you need to leave the trim width set at the brick mould width (usually 2") and apply a zero-depth trim to the inside.

To do that, open the Trim Designer. In the dialog box labeled "Trim Design Selection", click the lower left-hand shape. Enter 0 (zero) for width. Leave Height at 2". Click OK. You now have a 2-dimensional plane (a thin straight line) for your moulding profile. Click "Save trim to library...".

Select the "Window and Door Casing" category. Name the trim "No Depth Casing", Enter a description. Click OK. Exit Trim Designer.

Build your window or one of the doorless openings and leave the trim width at the default (for now). You need to be able to see (and click on) the trim in order to paint or texture it. Do that first. You probably want it to match the wall color. See note at bottom about Punch shading shortcomings.

Now apply your zero-depth casing. For a doorless opening, apply it to both sides then set the trim width to zero. I have a real nice screenshot of an uncased arched opening using the zero-depth casing, but can't find the command to attach it here.

NOTES:

1. While you can simply set the trim width to zero on doorways using standard trim, you end up with an unsightly "flange" that sticks out well beyond the wall plane. The zero depth casing eliminates that.

2. For windows, certain graphics anamolies may occur due to the way punch does the virtual openings for windows, and the way certain graphics cards interpret the results. For example:

2a. With window trim set to 1/16" you may be able to see into the inside of the wall at certain angles. This occurs even though the window frame appears to be right up to the wall edge. You can prove this to yourself by editing your zero-depth casing to be just 1/32" wide (drag very slightly with snap turned off) and see that it now plainly sticks right through the wall.

2b. With trim width set to something wider, you may variously see a mixture of the wall color and the trim color at the same time. This is due partly because the trim is right up tight behind the wall (which is just a two-dimensional plane) and your graphics card can't decide which color it should show, and partly because of the unrealistic way Punch does shading. You can see that shading problem by simply breaking a wall, or adding a point to it somewhere that's visible and viewing the unsightly result.