I made a set of triple boards from a plan on the internet. Pine boards, all thread, nuts & bolts, orange and white paint. Very cheap. Just make sure if you're using wood to seal it first so they don't become waterlogged with time.

I was very happy with the way they ran. I ran three musky crankbaits from each line and they pulled just fine. I never had them in anything but a slight chop though, so cannot comment on how they run through whitecaps.

Be careful with the triple boards if you go that way. You need a strong mast, but more importantly, you need a strong connection between your mast and the boat itself! Think through-bolts and big washers.