Here are some shots of the planking / caulking procedure. I first cut a length of strip to just larger than the required size, then slowly sand one end a little at a time until it fits perfectly. Then I cut a matching length of the plastic. Glue is applied and the strip is added as shown below, with a tiny space between the old and new strips.
![Plank with glue in place](http://blog.clockwork-orrery.com/wp-content/uploads/sites/4/2019/04/sultana_build_log_032_01-512x341.jpg)