Seal the insides of the skins really well (forget about weight and use extra resin!)
Glass with 6 ounce deck, 4 bottom, with deck reinforcement patches (under or over the skin, your choice)
Install a goretex vent.
Your water problems will be over!
I know that you already know all this, but I thought i'd repeat it again.

For a travel board, i'd even glass it double 4 deck and 6 bottom.
Built to last.
I'm so jealous of you going to indo...... enjoy!!