re: Project within a project - molding with molding planes

If you haven’t read Matt Bickford’s Mouldings in Practice that might be a help when figuring out how to reproduce things. He has a pretty clear explanation of what rabbets you need to make to lead to a finished profile, what hollows and rounds you’ll need to get there, and how to think through the process.

Looks like you’re getting there, but his book might save a few mistakes along the way.