I am going to start with adding the scuppers.  At the time I remember being thrilled by figuring out any way to do this at all.  I hope it may help someone down the line.  I recall that the hull planks were 3/16".  I found that using a 1/8" plank allowed the foredeck and quarterdeck scuppers to be cut from either side of a single plank.  I then added a 1/16 plank above to complete the job.  I was able to do this as my plan was to paint the hull.  It would probably look strange on a natural wood