our 13' fryan will plane with just my fat 115kg arse in it AS LONG AS I get to centre of boat(that's with 6hp merc).....it might be worthwhile fitting seat or having movable one that you can use on your own,a hunk of pvc pipe fits snuggly over outboard throttle which allows me to control boat from forward,this also works better for standing up to peer into water to check depth as you travel along.very tidy job...as to your pontoons turning into bomb if filled with polystyrene...you COULD use bean bag filler which would allow you to blow them out with compressed air if needed.
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