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I went down this road myself, I ended up just buying a pair of planer boards. Aurora lites, 3 footers. They are worth every penny and never sag on a turn. They fold up nice for storage and are made with quality components. Just my .02
I've made a set from wood and painted just to have them. There are plans all over the net...just do a search. Now they may not pull as well as some but for the little that I use them they do me just fine. I find myself running 6 inline boards mostly since I typically have 2 to 3 people on board. I love the ease use of inlines and how fast I can pick up and move.
I started planar board fishing in the 1980's with home-made boards. Started with boards made of pine, painted bright yellow, strip on lead on the bottom for ballast, woven nylon line on broom handles for tethers. Caught a lot of Great Lakes salmon and trout with them. Still have the boards. I haven't run anything but in-line boards for the past 15 years.