Hey Indah, a bit late, but here are my 2c.
To be honest your idea sounds a bit like a prison cell to me. Ventilated/air conditioned one but still, no lights? no windows? and closed door?? I would never sleep in such a thing even if it was free of charge... Keep in mind I am a bit claustrophobic - but that's just me.
The obvious idea would be new air conditioned rooms with proper sound proof walls (eg brick or similar) and good screened windows/doors - but I 'd guess this would be too expensive or unfeasible in your case.
I've spend 3 weeks sleeping in huts (home stays) in Raja Ampat and several other nights here and there throughout Indonesia. I never had problems with heat during the night as the huts as usually very well ventilated and the night breeze does wonders. Mosquitoes can be a problem but a net and some skin protection usually does the trick. Noise can be a real issue though.
Please if you make these cubicles, leave some traditional rooms without them in case I ever make it there

All the best