Yes, i don’t use electric planer i shape my boards from eps bloc with hot wires. First the classic 2 feet sliding on rocker/foil wood template set to finish rocker and foil target. Then cut outline with an 90° hit wire tool sliding along templates, then I cut two wide bevel for deck crowning with a two angle hotwire from their I finish with Fred tools surform, surforms and sandpaper on blocs. Key of my process are my sheets number ( calculate where to set my bevel from width/thickness and rail profile) and my rail lines tracing tool. Will take photos when i can… For sure not a fast process but for me a routine that allow me to end with what i want quietly.
That would be fantastic if you could post some photos. Im more of a visual guy. My thinking is the exact same process as you have described. I like the idea of quiet and less mess. I would think that it would also be easier to get the rails even on both sides when you are working with square edges and flat surfaces as opposed to the emoulded blanks that have the domed decks. I look forward to eyeballing your tools of the trade.
Oh BTW… I will be picking your brain from now on…lol