Template is made of two 1/2X1 plywood battens pinned exactly at panel location, "truss" parts are 1/8 X 1 1/2 plywood hotmelt glued and stapled; the tighter these are the less movement there will be when its taken off the frames. The lower (upper) batten is the same one that was used to bevel the keelson using the Tom Hill block on power and hand plane method; the second batten was added after beveling; this "should" work for all the planks.
Template is clamped to the garboard blank (which was rough shaped with a skill saw prior to scarfing using the template) and a pattern bit in the router is used directly against the template. The soup can cointains 14lbs of lead and functions as a counter balance.
The opposite plank is cut using the first one as a guide; the garboards fit beautifuly and only require a little fiting at their tips