Just got the porter cable 4212 dovetail jig and am lumbering along and finally producing some draws. My question is how can I use the templates (the through dovetail one in this case) on larger boards? For example, I want to make a blanket chest that is about 24 inches tall and would like to have through dovetail all the way from top to almost the bottom. Yeah, I could purchase one of those Keller Jigs ($$$$$), but I think I remember seeing a guy from Porter Cable saying that you can just make your own “keller-type jig” using the templates that come with the 4212. Anyone ever do this? Please explain. Thanks.