Here is one way to get a solid Door Panel. I have turned off the out-of-the-box Panel and Swing Components, leaving only the Frame component on. For the sake of understanding what the Custom View Block is providing, I set that component to Color 200 (purple). You could set it to ByBlock and it will pick up the color of the Door (which could be By Layer) and look the same as the Frame component. (All of the other attributes can also be set for the Custom Block.
I left an instance of the Custom Block (DoorPanel_P) in the drawing file. It is "small" as it is set up as a unit block, with the width of the Door being represented by one unit in the block. The arc for the swing has a one-unit radius. The rectangle is one unit in the panel width direction (perpendicular to the host Wall). The rectangle is set up for a 3'-0" wide door, so the rectangle "thickness" is 7/144" (1.75" divided by 3'-0").
This block is set up to show the panel at 90 degrees open. There is a polyline rectangle, a solid hatch, and an arc for the swing. All components are drawn on Layer 0 and have ByBlock color, linetype, plot style, and lineweight. That allows them to display/plot per the settings assigned to the Custom Block component.

The Custom Block is added to the Plan Display Representation [DR] for Doors, by setting a Door Style Override for that DR. Edit the override. On the Other tab, in the Custom Block Display area, select the Add button. (To make changes in the future, select the Custom Block in the list box and chose the Edit button.)
Here are the settings I used for the DoorPanel_P block.

The unit block is placed at the inside of the Frame Component (Component section, bottom left). My Doors are measured to the inside of the frame, so scaling by the Width uses the nominal Door Panel width. The Lock XY Ratio toggle is checked so that the unit block is scaled in both the X and Y directions.
The insertion point is at the Left/Back/Bottom of the Door Frame, with no insertion offset.
Once a Custom Block is added, it appears as a Display Component on the Layer/Color/Linetype tab, and settings you make here will be respected by elements within the Custom Block that are on Layer 0 with ByBlock attributes.

You can see the Color 200 setting here on DoorPanel_P. I would typically change that back to BYBLOCK so that it looks like the other components, once I am certain it is behaving as expected.
As previously noted, this only works precisely for Doors that are 3'-0" wide. Wider or narrower Doors will have a different panel thickness than the designed 1.75" because wider Doors are scaling up by more than 36 and narrower doors are scaling up by less than 36. You can see that in the example instances I put in the drawing.

I have attached the drawing file that generated the graphics above so you can see it live. Post back with any questions you have; the above is a quick explanation rather than a step-by-step.
David Koch
AutoCAD Architecture and Revit User
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