Very nice doors, It looks as though they are old growth fir. Fir is hard and brittle. I'd like to see your trim cleanup/reshape tool.
There are not alot of ways to improve on the design of a nail.{ If it isnt broke dont fix it.} It wasnt to long before those nails were made that most all nails were cut nails. A very different shaped nail.
I had to refinish a bunch of kitchen cabinets not to long ago, I found a wonderful sanding tool call a Sanding Mop. a little spendy but it conformed to all the small details on the trim. I should have bought one years ago. LOL
Your doing a great job. Stain? Clear coat? For Sale? Reframe your home entry?