Green Building Q&A: Is this too much door sill cantilever?
You really should not install the trim on top of the clap boards...leaves holes hard to caulk....Install the trim around the door, then install the siding, butting to the trim....make sure the siding is not going to be proud of the trim. You may need to use thicker trim or just strap the back of the trim. This reduces the thickness of the opening and depth of threshold. Up in the GWNorth we often install screen doors on the trim. As for the cantilever...how deep is the threshold of the door?