Has anyone found either a standard (4-tile) garage door centered on 5 wall tiles, or one of the modded 3-tile garage doors centered on 4 tiles? A full wall tile is too much space at the edge of a garage door on a lot of house designs.

Alternately, can anyone direct me to a tutorial about how to do that kind of manipulation on doors/windows that doesn't assume I already know how to create custom objects?

This is an excellent garage door set. I tend to use the 3x1 almost always. https://www.thesimsresource.com/dow...ms3/id/1055910/

Here is a pattern with fake doors - they almost look like a garage door??? https://www.thesimsresource.com/dow...nk-/id/1078282/