Kind of redneck rigging? If the 2x6 is on the bottom you could bolt it on, effectively using the 2x6 as a clamp to hold the foam piece(s) to the underside of the deck. I'd use big washers on the deck because there is bound to be vibration. Hard to visualize exactly what you are working with.
I have 7 billets of varying lengths all about 1x2.5’. I have 32 linear feet of this styrofoam. Also youthful enthusiasm.
How much room under the deck? Consider your trailer too, will installation impede the deck supports on the pontoon trailer? 1ft x 2.5ft x 32ft? Yeah, I'd bolt them on with 2x3 or 2x4 clamping down each side lengthwise with the boat. It can firmly clamp the foam to the deck and protect the foam from some future damage. You could use threaded rod cut to length, use your welding skills to weld a nut on one end making them into bolts. Add big diameter washers, drill some holes ... done on the cheap.
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